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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Dulieu%2C+O&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Dulieu%2C+O&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Dulieu%2C+O&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.01209">arXiv:2411.01209</a> <span> [<a href="https://arxiv.org/pdf/2411.01209">pdf</a>, <a href="https://arxiv.org/format/2411.01209">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic and Molecular Clusters">physics.atm-clus</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> </div> <p class="title is-5 mathjax"> Associative ionization in a dilute ultracold $^7$Li gas probed with a hybrid trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Joshi%2C+N">N. Joshi</a>, <a href="/search/physics?searchtype=author&query=Mahendrakar%2C+V">Vaibhav Mahendrakar</a>, <a href="/search/physics?searchtype=author&query=Niranjan%2C+M">M. Niranjan</a>, <a href="/search/physics?searchtype=author&query=Yadav%2C+R+S">Raghuveer Singh Yadav</a>, <a href="/search/physics?searchtype=author&query=Krishnakumar%2C+E">E Krishnakumar</a>, <a href="/search/physics?searchtype=author&query=Pandey%2C+A">A. Pandey</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">R Vexiau</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">O. Dulieu</a>, <a href="/search/physics?searchtype=author&query=Rangwala%2C+S+A">S. A. Rangwala</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.01209v1-abstract-short" style="display: inline;"> The formation of Li$_2^+$ and subsequently Li$^+$ ions, during the excitation of $^7$Li atoms to the $3S_{1/2}$ state in a $^7$Li magneto optical trap (MOT), is probed in an ion-atom hybrid trap. Associative ionization occurs during the collision of Li($2P_{3/2}$) and Li($3S_{1/2}$) ultracold atoms, creating Li$_2^+$ ions. Photodissociation of Li$_2^+$ by the MOT lasers is an active channel for th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.01209v1-abstract-full').style.display = 'inline'; document.getElementById('2411.01209v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.01209v1-abstract-full" style="display: none;"> The formation of Li$_2^+$ and subsequently Li$^+$ ions, during the excitation of $^7$Li atoms to the $3S_{1/2}$ state in a $^7$Li magneto optical trap (MOT), is probed in an ion-atom hybrid trap. Associative ionization occurs during the collision of Li($2P_{3/2}$) and Li($3S_{1/2}$) ultracold atoms, creating Li$_2^+$ ions. Photodissociation of Li$_2^+$ by the MOT lasers is an active channel for the conversion of Li$_2^+$ to Li$^+$. A fraction of the Li$_2^+$ ions is long lived even in the presence of MOT light. Additionally, rapid formation of Li$^+$ from Li$_2^+$ in the absence of MOT light is observed. Resonant excitation of ultracold atoms, resulting in intricate molecular dynamics, reveals important processes in ultracold dilute gases. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.01209v1-abstract-full').style.display = 'none'; document.getElementById('2411.01209v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">The submitted manuscript consists of 10 pages including references. It consists of 11 figures including the figures in the supplemental material</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.16833">arXiv:2409.16833</a> <span> [<a href="https://arxiv.org/pdf/2409.16833">pdf</a>, <a href="https://arxiv.org/format/2409.16833">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> </div> <p class="title is-5 mathjax"> Ultracold Interactions between Ions and Polar Molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Karpa%2C+L">Leon Karpa</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.16833v1-abstract-short" style="display: inline;"> We discuss a platform for observing and controlling the interactions between atomic ions and a quantum gas of polar molecules in the ultracold regime. This approach is based on the combination of several recently developed methods in two so-far complementary research domains: ion-atom collisions and studies of ultracold polar molecules. In contrast to collisions between ions and ground-state atoms… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.16833v1-abstract-full').style.display = 'inline'; document.getElementById('2409.16833v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.16833v1-abstract-full" style="display: none;"> We discuss a platform for observing and controlling the interactions between atomic ions and a quantum gas of polar molecules in the ultracold regime. This approach is based on the combination of several recently developed methods in two so-far complementary research domains: ion-atom collisions and studies of ultracold polar molecules. In contrast to collisions between ions and ground-state atoms, which are dominated by losses due to three-body recombination (TBR) already at densities far below those typical for quantum degenerate ensembles, our proposal makes use of polar molecules, their rich level structure, and sensitivity to electric fields to design effective interaction potentials where ion-neutral TBR losses and molecule-molecule losses due to sticky collisions are strongly suppressed. This may enable access to the deep quantum regime of interaction with a broad range of applications including the potential formation of novel many-body self-bound states, quantum simulations, and quantum chemistry between polyatomic molecules. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.16833v1-abstract-full').style.display = 'none'; document.getElementById('2409.16833v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 pages, 9 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.14824">arXiv:2407.14824</a> <span> [<a href="https://arxiv.org/pdf/2407.14824">pdf</a>, <a href="https://arxiv.org/format/2407.14824">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> </div> <p class="title is-5 mathjax"> Ultracold charged atom-dimer collisions: state-selective charge exchange and three-body recombination </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Pandey%2C+A">Amrendra Pandey</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">Romain Vexiau</a>, <a href="/search/physics?searchtype=author&query=Marcassa%2C+L+G">Luis Gustavo Marcassa</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">Nadia Bouloufa-Maafa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.14824v1-abstract-short" style="display: inline;"> Based on an accurate determination of the potential energy surfaces of Rb$_3^+$ correlated to its first asymptotic limit Rb$^+$$+$Rb($5s$)$+$Rb($5s$), we identify the presence of intersections of a pair of singlet and triplet surfaces over all interparticle distances, leading to Jahn-Teller couplings. We elaborate scenarios for charge exchange between ultracold charged atom-dimer complex (Rb$+$Rb… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.14824v1-abstract-full').style.display = 'inline'; document.getElementById('2407.14824v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.14824v1-abstract-full" style="display: none;"> Based on an accurate determination of the potential energy surfaces of Rb$_3^+$ correlated to its first asymptotic limit Rb$^+$$+$Rb($5s$)$+$Rb($5s$), we identify the presence of intersections of a pair of singlet and triplet surfaces over all interparticle distances, leading to Jahn-Teller couplings. We elaborate scenarios for charge exchange between ultracold charged atom-dimer complex (Rb$+$Rb$_2^+$ or Rb$^+$$+$Rb$_2$), predicting a strong selectivity on the preparation of the initial state of the dimer. We also demonstrate that the JT couplings must drive the three-body recombination (TBR) of Rb$^+$, Rb, and Rb at ultracold energies. Using the current analysis, we provide a consistent picture of the TBR experiments performed in ion-atom hybrid Rb samples \cite{dieterle2020inelastic,harter2012single}. We also demonstrate the presence of JT coupling as a general phenomenon in the singly-charged homonuclear alkali triatomic systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.14824v1-abstract-full').style.display = 'none'; document.getElementById('2407.14824v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 16 Figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.16017">arXiv:2406.16017</a> <span> [<a href="https://arxiv.org/pdf/2406.16017">pdf</a>, <a href="https://arxiv.org/format/2406.16017">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> </div> <p class="title is-5 mathjax"> Competing excitation quenching and charge exchange in ultracold Li-Ba$^+$ collisions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Xing%2C+X">Xiaodong Xing</a>, <a href="/search/physics?searchtype=author&query=Weckesser%2C+P">Pascal Weckesser</a>, <a href="/search/physics?searchtype=author&query=Thielemann%2C+F">Fabian Thielemann</a>, <a href="/search/physics?searchtype=author&query=J%C3%B3n%C3%A1s%2C+T">Tibor J贸n谩s</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">Romain Vexiau</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">Nadia Bouloufa-Maafa</a>, <a href="/search/physics?searchtype=author&query=Luc-Koenig%2C+E">Eliane Luc-Koenig</a>, <a href="/search/physics?searchtype=author&query=Madison%2C+K+W">Kirk W. Madison</a>, <a href="/search/physics?searchtype=author&query=Orb%C3%A1n%2C+A">Andrea Orb谩n</a>, <a href="/search/physics?searchtype=author&query=Xie%2C+T">Ting Xie</a>, <a href="/search/physics?searchtype=author&query=Schaetz%2C+T">Tobias Schaetz</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2406.16017v1-abstract-short" style="display: inline;"> Hybrid atom-ion systems are a rich and powerful platform for studying chemical reactions, as they feature both excellent control over the electronic state preparation and readout as well as a versatile tunability over the scattering energy, ranging from the few-partial wave regime to the quantum regime. In this work, we make use of these excellent control knobs, and present a joint experimental an… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.16017v1-abstract-full').style.display = 'inline'; document.getElementById('2406.16017v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.16017v1-abstract-full" style="display: none;"> Hybrid atom-ion systems are a rich and powerful platform for studying chemical reactions, as they feature both excellent control over the electronic state preparation and readout as well as a versatile tunability over the scattering energy, ranging from the few-partial wave regime to the quantum regime. In this work, we make use of these excellent control knobs, and present a joint experimental and theoretical study of the collisions of a single $^{138}$Ba$^+$ ion prepared in the $5d\,^2D_{3/2,5/2}$ metastable states with a ground state $^6$Li gas near quantum degeneracy. We show that in contrast to previously reported atom-ion mixtures, several non-radiative processes, including charge exchange, excitation exchange and quenching, compete with each other due to the inherent complexity of the ion-atom molecular structure. We present a full quantum model based on high-level electronic structure calculations involving spin-orbit couplings. Results are in excellent agreement with observations, highlighting the strong coupling between the internal angular momenta and the mechanical rotation of the colliding pair, which is relevant in any other hybrid system composed of an alkali-metal atom and an alkaline-earth ion. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.16017v1-abstract-full').style.display = 'none'; document.getElementById('2406.16017v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 pages, 15 figures, 4 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.06427">arXiv:2405.06427</a> <span> [<a href="https://arxiv.org/pdf/2405.06427">pdf</a>, <a href="https://arxiv.org/format/2405.06427">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atmospheric and Oceanic Physics">physics.ao-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0963-0252/24/3/035005">10.1088/0963-0252/24/3/035005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dissociative recombination, and vibrational excitation of CO$^{+}$: model calculations and comparison with experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mezei%2C+J+Z">J. Zs Mezei</a>, <a href="/search/physics?searchtype=author&query=Backodissa-Kiminou%2C+R+D">R. D. Backodissa-Kiminou</a>, <a href="/search/physics?searchtype=author&query=Tudorache%2C+D+E">D. E. Tudorache</a>, <a href="/search/physics?searchtype=author&query=Morel%2C+V">V. Morel</a>, <a href="/search/physics?searchtype=author&query=Chakrabarti%2C+K">K. Chakrabarti</a>, <a href="/search/physics?searchtype=author&query=Motapon%2C+O">O. Motapon</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">O. Dulieu</a>, <a href="/search/physics?searchtype=author&query=Robert%2C+J">J. Robert</a>, <a href="/search/physics?searchtype=author&query=Tchang-Brillet%2C+W+-+L">W. -脺. L. Tchang-Brillet</a>, <a href="/search/physics?searchtype=author&query=Bultel%2C+A">A. Bultel</a>, <a href="/search/physics?searchtype=author&query=Urbain%2C+X">X. Urbain</a>, <a href="/search/physics?searchtype=author&query=Tennyson%2C+J">J. Tennyson</a>, <a href="/search/physics?searchtype=author&query=Hassouni%2C+K">K. Hassouni</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+I+F">I. F. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.06427v1-abstract-short" style="display: inline;"> The latest molecular data - potential energy curves and Rydberg$/$valence interactions - characterizing the super-excited electronic states of CO are reviewed, in order to provide inputs for the study of their fragmentation dynamics. Starting from this input, the main paths and mechanisms for CO$^+$ dissociative recombination are analyzed; its cross sections are computed using a method based on Mu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.06427v1-abstract-full').style.display = 'inline'; document.getElementById('2405.06427v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.06427v1-abstract-full" style="display: none;"> The latest molecular data - potential energy curves and Rydberg$/$valence interactions - characterizing the super-excited electronic states of CO are reviewed, in order to provide inputs for the study of their fragmentation dynamics. Starting from this input, the main paths and mechanisms for CO$^+$ dissociative recombination are analyzed; its cross sections are computed using a method based on Multichannel Quantum Defect Theory. Convoluted cross sections, giving both isotropic and anisotropic Maxwellian rate-coefficients, are compared with merged-beam and storage-ring experimental results. The calculated cross sections underestimate the measured ones by a factor of $2$, but display a very similar resonant shape. These facts confirm the quality of our approach for the dynamics, and call for more accurate and more extensive molecular structure calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.06427v1-abstract-full').style.display = 'none'; document.getElementById('2405.06427v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 8 figures 5 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Plasma Sources Sci. Technol. 24 (2015) 035005 (15pp) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.05850">arXiv:2405.05850</a> <span> [<a href="https://arxiv.org/pdf/2405.05850">pdf</a>, <a href="https://arxiv.org/format/2405.05850">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0963-0252/25/5/055022">10.1088/0963-0252/25/5/055022 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dissociative recombination and vibrational excitation of BF$^{+}$ in low energy electron collisions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mezei%2C+J+Z">J. Zs Mezei</a>, <a href="/search/physics?searchtype=author&query=Colboc%2C+F">F. Colboc</a>, <a href="/search/physics?searchtype=author&query=Pop%2C+N">N. Pop</a>, <a href="/search/physics?searchtype=author&query=Ilie%2C+S">S. Ilie</a>, <a href="/search/physics?searchtype=author&query=Chakrabarti%2C+K">K. Chakrabarti</a>, <a href="/search/physics?searchtype=author&query=Niyonzima%2C+S">S. Niyonzima</a>, <a href="/search/physics?searchtype=author&query=Leppers%2C+M">M. Leppers</a>, <a href="/search/physics?searchtype=author&query=Bultel%2C+A">A. Bultel</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">O. Dulieu</a>, <a href="/search/physics?searchtype=author&query=Motapon%2C+O">O. Motapon</a>, <a href="/search/physics?searchtype=author&query=Tennyson%2C+J">J. Tennyson</a>, <a href="/search/physics?searchtype=author&query=Hassouni%2C+K">K. Hassouni</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+I+F">I. F. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.05850v1-abstract-short" style="display: inline;"> The latest molecular data - potential energy curves and Rydberg-valence interactions - characterising the super-excited electronic states of BF are reviewed in order to provide the input for the study of their fragmentation dynamics. Starting from this input, the main paths and mechanisms of BF$^+$ dissociative recombination and vibrational excitation are analysed. Their cross sections are compute… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.05850v1-abstract-full').style.display = 'inline'; document.getElementById('2405.05850v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.05850v1-abstract-full" style="display: none;"> The latest molecular data - potential energy curves and Rydberg-valence interactions - characterising the super-excited electronic states of BF are reviewed in order to provide the input for the study of their fragmentation dynamics. Starting from this input, the main paths and mechanisms of BF$^+$ dissociative recombination and vibrational excitation are analysed. Their cross sections are computed for the first time using a method based on the multichannel quantum defect theory (MQDT), and Maxwellian rate-coefficients are calculated and displayed in ready-to-be-used format for low temperature plasma kinetics simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.05850v1-abstract-full').style.display = 'none'; document.getElementById('2405.05850v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 4 figures, 4 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Plasma Sources Sci. Technol. 25 (2016) 055022 (12pp) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.19302">arXiv:2404.19302</a> <span> [<a href="https://arxiv.org/pdf/2404.19302">pdf</a>, <a href="https://arxiv.org/format/2404.19302">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6455/aab937">10.1088/1361-6455/aab937 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dissociative recombination of the CH$^+$ molecular ion at low energy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Chakrabarti%2C+K">K. Chakrabarti</a>, <a href="/search/physics?searchtype=author&query=Mezei%2C+J+Z">J. Zs Mezei</a>, <a href="/search/physics?searchtype=author&query=Motapon%2C+O">O. Motapon</a>, <a href="/search/physics?searchtype=author&query=Faure%2C+A">A. Faure</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">O. Dulieu</a>, <a href="/search/physics?searchtype=author&query=Hassouni%2C+K">K. Hassouni</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+I+F">I. F. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2404.19302v1-abstract-short" style="display: inline;"> The reactive collisions of the CH$^+$ molecular ion with electrons is studied in the framework of the multichannel quantum defect theory, taking into account the contribution of the core-excited Rydberg states. In addition to the $X^1危^+$ ground state of the ion, we also consider the contribution to the dynamics of the $a^3螤$ and $A^1螤$ excited states of CH$^+$. Our results - in the case of the di… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.19302v1-abstract-full').style.display = 'inline'; document.getElementById('2404.19302v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.19302v1-abstract-full" style="display: none;"> The reactive collisions of the CH$^+$ molecular ion with electrons is studied in the framework of the multichannel quantum defect theory, taking into account the contribution of the core-excited Rydberg states. In addition to the $X^1危^+$ ground state of the ion, we also consider the contribution to the dynamics of the $a^3螤$ and $A^1螤$ excited states of CH$^+$. Our results - in the case of the dissociative recombination in good agreement with the storage ring measurements - rely on decisive improvements - complete account of the ionisation channels and accurate evaluation of the reaction matrix - of a previously used model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.19302v1-abstract-full').style.display = 'none'; document.getElementById('2404.19302v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. B: At. Mol. Opt. Phys. 51 (2018) 104002 (8pp) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.15327">arXiv:2303.15327</a> <span> [<a href="https://arxiv.org/pdf/2303.15327">pdf</a>, <a href="https://arxiv.org/format/2303.15327">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> </div> <p class="title is-5 mathjax"> Charge transfer of polyatomic molecules in ion-atom hybrid traps: Stereodynamics in the millikelvin regime </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Voute%2C+A">Alexandre Voute</a>, <a href="/search/physics?searchtype=author&query=D%C3%B6rfler%2C+A">Alexander D枚rfler</a>, <a href="/search/physics?searchtype=author&query=Wiesenfeld%2C+L">Laurent Wiesenfeld</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">Fabien Gatti</a>, <a href="/search/physics?searchtype=author&query=Pel%C3%A1ez%2C+D">Daniel Pel谩ez</a>, <a href="/search/physics?searchtype=author&query=Willitsch%2C+S">Stefan Willitsch</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.15327v3-abstract-short" style="display: inline;"> Rate constants for the charge transfer reaction between N${}_{2}$H${}^{+}$ and Rb in the mK regime are measured in an ion-atom hybrid trap and are found to be lower than the Langevin capture limit. Multireference ab initio computation of the potential energy surfaces involved in the reaction reveals that the low-temperature charge transfer is hindered by short-range features highly dependent on th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.15327v3-abstract-full').style.display = 'inline'; document.getElementById('2303.15327v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.15327v3-abstract-full" style="display: none;"> Rate constants for the charge transfer reaction between N${}_{2}$H${}^{+}$ and Rb in the mK regime are measured in an ion-atom hybrid trap and are found to be lower than the Langevin capture limit. Multireference ab initio computation of the potential energy surfaces involved in the reaction reveals that the low-temperature charge transfer is hindered by short-range features highly dependent on the collision angle and is promoted by a deformation of the molecular frame. The present study highlights the importance of polyatomic effects and of stereodynamics in cold molecular ion-neutral collisions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.15327v3-abstract-full').style.display = 'none'; document.getElementById('2303.15327v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">See supplemental material for details on electronic structure methods, estimates of transition probabilities and timescales, and other PES cuts</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.11891">arXiv:2303.11891</a> <span> [<a href="https://arxiv.org/pdf/2303.11891">pdf</a>, <a href="https://arxiv.org/format/2303.11891">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> </div> <p class="title is-5 mathjax"> Modeling photoassociative spectra of ultracold NaK+K </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Shammout%2C+B">Baraa Shammout</a>, <a href="/search/physics?searchtype=author&query=Karpa%2C+L">Leon Karpa</a>, <a href="/search/physics?searchtype=author&query=Ospelkaus%2C+S">Silke Ospelkaus</a>, <a href="/search/physics?searchtype=author&query=Tiemann%2C+E">Eberhard Tiemann</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.11891v1-abstract-short" style="display: inline;"> A model for photoassociation of ultracold atoms and molecules is presented, and applied to the case of $^{39}$K and $^{23}$Na$^{39}$K bosonic particles. The model relies on the assumption that photoaossociation is dominated by long-range atom-molecule interactions, well outside the chemical bond region. The frequency of the photoassociation laser is chosen close to a bound-bound rovibronic transit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.11891v1-abstract-full').style.display = 'inline'; document.getElementById('2303.11891v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.11891v1-abstract-full" style="display: none;"> A model for photoassociation of ultracold atoms and molecules is presented, and applied to the case of $^{39}$K and $^{23}$Na$^{39}$K bosonic particles. The model relies on the assumption that photoaossociation is dominated by long-range atom-molecule interactions, well outside the chemical bond region. The frequency of the photoassociation laser is chosen close to a bound-bound rovibronic transition from the $X^1危^+$ ground state toward the metastable $b^3螤$ lowest excited state of $^{23}$Na$^{39}$K, allowing to neglect any other excitation which could hinder the photoassociation detection. The energy level structure of the long-range $^{39}$K$\cdots$$^{23}$Na$^{39}$K excited super-dimer is computed in the space-fixed frame by solving coupled-channel equations, involving the coupling between the $^{23}$Na$^{39}$K internal rotation with the mechanical rotation of the super-dimer complex. A quite rich structure is obtained, and the corresponding photoassociation rates are presented. Other possible photossociation transitions are discussed in the context of the proposed model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.11891v1-abstract-full').style.display = 'none'; document.getElementById('2303.11891v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.08008">arXiv:2209.08008</a> <span> [<a href="https://arxiv.org/pdf/2209.08008">pdf</a>, <a href="https://arxiv.org/format/2209.08008">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.106.062809">10.1103/PhysRevA.106.062809 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ion loss events in a cold Rb-Ca$^+$ hybrid trap: photodissociation, black-body radiation and non-radiative charge exchange </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Xing%2C+X">Xiaodong Xing</a>, <a href="/search/physics?searchtype=author&query=Silva%2C+H+d">Humberto da Silva Jr</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">Romain Vexiau</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">Nadia Bouloufa-Maafa</a>, <a href="/search/physics?searchtype=author&query=Willitsch%2C+S">Stefan Willitsch</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.08008v2-abstract-short" style="display: inline;"> We theoretically investigate the collisional dynamics of laser-cooled $^{87}$Rb ground-state atoms and $^{40}$Ca$^+$ ground-state ions in the context of the hybrid trap experiment of Ref. [Phys. Rev. Lett. 107, 243202 (2011)], leading to ion losses. Cold $^{87}$Rb$^{40}$Ca$^+$ ground-state molecular ions are created by radiative association, and we demonstrate that they are protected against photo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.08008v2-abstract-full').style.display = 'inline'; document.getElementById('2209.08008v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.08008v2-abstract-full" style="display: none;"> We theoretically investigate the collisional dynamics of laser-cooled $^{87}$Rb ground-state atoms and $^{40}$Ca$^+$ ground-state ions in the context of the hybrid trap experiment of Ref. [Phys. Rev. Lett. 107, 243202 (2011)], leading to ion losses. Cold $^{87}$Rb$^{40}$Ca$^+$ ground-state molecular ions are created by radiative association, and we demonstrate that they are protected against photodissociation by black-body radiation and by the $^{40}$Ca$^+$ cooling laser at 397~nm. This study yields an interpretation of the direct observation of $^{87}$Rb$^{40}$Ca$^+$ ions in the experiment, in contrast to other hybrid trap experiments using other species. Based on novel molecular data for the spin-orbit interaction, we also confirm that the non-radiative charge-exchange is the dominant loss process for Ca$^+$ and obtain rates in agreement with experimental observations and a previous calculation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.08008v2-abstract-full').style.display = 'none'; document.getElementById('2209.08008v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">PRA accepted. It includes 15 figures,29 pages, 45 references</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.14001">arXiv:2207.14001</a> <span> [<a href="https://arxiv.org/pdf/2207.14001">pdf</a>, <a href="https://arxiv.org/format/2207.14001">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> FitAik: a package to calculate least-square fitted atomic transitions probabilities. Application to the Er+ lanthanide ion </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lepers%2C+M">Maxence Lepers</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Wyart%2C+J">Jean-Fran莽ois Wyart</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.14001v3-abstract-short" style="display: inline;"> We present a new method implemented in our new package \textit{FitAik}, to perform least-squares fitting of calculated and experimental atomic transition probabilities, by using the mono-electronic transition integrals $\langle n\ell |r| n'\ell' \rangle$ (with $r$ the electronic radial coordinate) as adjustable quantities. \textit{FitAik} is interfaced to the Cowan suite of codes, for which it aut… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.14001v3-abstract-full').style.display = 'inline'; document.getElementById('2207.14001v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.14001v3-abstract-full" style="display: none;"> We present a new method implemented in our new package \textit{FitAik}, to perform least-squares fitting of calculated and experimental atomic transition probabilities, by using the mono-electronic transition integrals $\langle n\ell |r| n'\ell' \rangle$ (with $r$ the electronic radial coordinate) as adjustable quantities. \textit{FitAik} is interfaced to the Cowan suite of codes, for which it automatically writes input files and reads output files. We illustrate our procedure with the example of Er$^{+}$ ion, for which the agreement between calculated and experimental Einstein coefficients is found to be very good. The source code of \emph{FitAik} can be found on GitLab, and the calculated Einstein coefficients are stored in our new database CaDDiACs. They are also used to calculate the dynamic dipole polarizability of Er$^+$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.14001v3-abstract-full').style.display = 'none'; document.getElementById('2207.14001v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.02484">arXiv:2207.02484</a> <span> [<a href="https://arxiv.org/pdf/2207.02484">pdf</a>, <a href="https://arxiv.org/format/2207.02484">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.jqsrt.2022.108330">10.1016/j.jqsrt.2022.108330 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Study of excited electronic states of the $^{39}$KCs molecule correlated with the K($4^2$S)+Cs($5^2$D) asymptote: experiment and theory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Szczepkowski%2C+J">Jacek Szczepkowski</a>, <a href="/search/physics?searchtype=author&query=Grochola%2C+A">Anna Grochola</a>, <a href="/search/physics?searchtype=author&query=Jastrzebski%2C+W">Wlodzimierz Jastrzebski</a>, <a href="/search/physics?searchtype=author&query=Kowalczyk%2C+P">Pawel Kowalczyk</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">Romain Vexiau</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">Nadia Bouloufa-Maafa</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.02484v1-abstract-short" style="display: inline;"> Using the polarisation labelling spectroscopy, we performed the detailed analysis of the level structure of excited electronic states of the $^{39}$KCs molecule in the excitation energy interval between 17500~cm$^{-1}$ and 18600~cm$^{-1}$ above the $v=0$ level of the $X^1危^+$ ground state. We prove that the observed states are strongly coupled by spin-orbit interaction above 18200~cm$^{-1}$, as ma… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.02484v1-abstract-full').style.display = 'inline'; document.getElementById('2207.02484v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.02484v1-abstract-full" style="display: none;"> Using the polarisation labelling spectroscopy, we performed the detailed analysis of the level structure of excited electronic states of the $^{39}$KCs molecule in the excitation energy interval between 17500~cm$^{-1}$ and 18600~cm$^{-1}$ above the $v=0$ level of the $X^1危^+$ ground state. We prove that the observed states are strongly coupled by spin-orbit interaction above 18200~cm$^{-1}$, as manifested by numerous perturbations in the recorded spectra. The spectra are interpreted with the guidance of accurate electronic structure calculations on KCs, including potential energy curves, transition electric dipole moments, and representation of the spin-orbit interaction with a quasi-diabatic effective Hamiltonian approach. The agreement between theory and experiment is found remarkable, clearly discriminating among the available theoretical data. This study confirms the accuracy of the polarisation labelling spectroscopy to analyse highly-excited electronic molecular states which present a dense level structure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.02484v1-abstract-full').style.display = 'none'; document.getElementById('2207.02484v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">26 pages, 10 figures, laser spectroscopy, KCs molecules electronic states, potential energy curves, ab initio calculations</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2108.00624">arXiv:2108.00624</a> <span> [<a href="https://arxiv.org/pdf/2108.00624">pdf</a>, <a href="https://arxiv.org/format/2108.00624">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/ac2dad">10.1088/1367-2630/ac2dad <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Characterization of the lowest excited-state ro-vibrational level of $^{23}$Na$^{87}$Rb </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=He%2C+J">Junyu He</a>, <a href="/search/physics?searchtype=author&query=Lin%2C+J">Junyu Lin</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">Romain Vexiau</a>, <a href="/search/physics?searchtype=author&query=Bouloufa%2C+N">Nadia Bouloufa</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+D">Dajun Wang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2108.00624v1-abstract-short" style="display: inline;"> Starting from an ultracold sample of ground-state $^{23}$Na$^{87}$Rb molecules, we investigate the lowest ro-vibrational level of the $b^3螤$ state with high resolution laser spectroscopy. This electronic spin-forbidden $X^1危^+ \leftrightarrow b^3螤$ transition features a nearly diagonal Franck-Condon factor and has been proposed useful for probing and manipulating the ultracold molecular gas. We me… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.00624v1-abstract-full').style.display = 'inline'; document.getElementById('2108.00624v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.00624v1-abstract-full" style="display: none;"> Starting from an ultracold sample of ground-state $^{23}$Na$^{87}$Rb molecules, we investigate the lowest ro-vibrational level of the $b^3螤$ state with high resolution laser spectroscopy. This electronic spin-forbidden $X^1危^+ \leftrightarrow b^3螤$ transition features a nearly diagonal Franck-Condon factor and has been proposed useful for probing and manipulating the ultracold molecular gas. We measure the transition strength directly by probing the ac Stark shift induced by near resonance light and determine the total excited-state spontaneous emission rate by observing the loss of molecules. From the extracted branching ratio and the theoretical modeling, we find that the leakage to the continuum of the $a^3危^+$ state plays the dominant role in the total transition linewidth. Based on these results, we show that it is feasible to create optical trapping potentials for maximizing the rotational coherence with laser light tuned to near this transition. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.00624v1-abstract-full').style.display = 'none'; document.getElementById('2108.00624v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.12813">arXiv:2011.12813</a> <span> [<a href="https://arxiv.org/pdf/2011.12813">pdf</a>, <a href="https://arxiv.org/format/2011.12813">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.103.033301">10.1103/PhysRevA.103.033301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Laser control of ultracold molecule formation: The case of RbSr </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Devolder%2C+A">Adrien Devolder</a>, <a href="/search/physics?searchtype=author&query=Desouter-Lecomte%2C+M">Mich猫le Desouter-Lecomte</a>, <a href="/search/physics?searchtype=author&query=Atabek%2C+O">Osman Atabek</a>, <a href="/search/physics?searchtype=author&query=Luc-Koenig%2C+E">Eliane Luc-Koenig</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2011.12813v1-abstract-short" style="display: inline;"> We have studied the formation of ultracold RbSr molecules with laser pulses. After discussing the advantages of the Mott insulator phase for the control with pulses, we present two classes of strategies. The first class involves two electronic states. Two extensions of stimulated Raman adiabatic passage (STIRAP) for multi-level transitions are used : alternating STIRAP (A-STIRAP) and straddle STIR… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.12813v1-abstract-full').style.display = 'inline'; document.getElementById('2011.12813v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.12813v1-abstract-full" style="display: none;"> We have studied the formation of ultracold RbSr molecules with laser pulses. After discussing the advantages of the Mott insulator phase for the control with pulses, we present two classes of strategies. The first class involves two electronic states. Two extensions of stimulated Raman adiabatic passage (STIRAP) for multi-level transitions are used : alternating STIRAP (A-STIRAP) and straddle STIRAP (S-STIRAP). Both transfer dynamics are modeled and compared. The second class of strategies involves only the electronic ground state and uses infrared (IR)/TeraHertz (THz) pulses. The chemical bond is first created by the application of a THz chirped pulse or $蟺$-pulse. Subsequently, the molecules are transferred to their ro-vibrational ground state using IR pulses. For this last step, different optimized pulse sequences through optimal control techniques, have been studied. The relative merits of these strategies in terms of efficiency and robustness are discussed within the experimental feasibility criteria of present laser technology. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.12813v1-abstract-full').style.display = 'none'; document.getElementById('2011.12813v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 103, 033301 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.09014">arXiv:2006.09014</a> <span> [<a href="https://arxiv.org/pdf/2006.09014">pdf</a>, <a href="https://arxiv.org/ps/2006.09014">ps</a>, <a href="https://arxiv.org/format/2006.09014">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.125.153202">10.1103/PhysRevLett.125.153202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Optical shielding of destructive chemical reactions between ultracold ground-state NaRb molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Xie%2C+T">T. Xie</a>, <a href="/search/physics?searchtype=author&query=Lepers%2C+M">M. Lepers</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">R. Vexiau</a>, <a href="/search/physics?searchtype=author&query=Orban%2C+A">A. Orban</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">O. Dulieu</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">N. Bouloufa-Maafa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.09014v2-abstract-short" style="display: inline;"> We propose a method to suppress the chemical reactions between ultracold bosonic ground-state $^{23}$Na$^{87}$Rb molecules based on optical shielding. By applying a laser with a frequency blue-detuned from the transition between the lowest rovibrational level of the electronic ground state $X^1危^+ (v_X=0, j_X=0)$, and the long-lived excited level $b^3螤_0 (v_b=0, j_b=1)$, the long-range dipole-dipo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.09014v2-abstract-full').style.display = 'inline'; document.getElementById('2006.09014v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.09014v2-abstract-full" style="display: none;"> We propose a method to suppress the chemical reactions between ultracold bosonic ground-state $^{23}$Na$^{87}$Rb molecules based on optical shielding. By applying a laser with a frequency blue-detuned from the transition between the lowest rovibrational level of the electronic ground state $X^1危^+ (v_X=0, j_X=0)$, and the long-lived excited level $b^3螤_0 (v_b=0, j_b=1)$, the long-range dipole-dipole interaction between the colliding molecules can be engineered, leading to a dramatic suppression of reactive and photoinduced inelastic collisions, for both linear and circular laser polarizations. We demonstrate that the spontaneous emission from $b^3螤_0 (v_b=0, j_b=1)$ does not deteriorate the shielding process. This opens the possibility for a strong increase of the lifetime of cold molecule traps, and for an efficient evaporative cooling. We also anticipate that the proposed mechanism is valid for alkali-metal diatomics with sufficiently large dipole-dipole interactions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.09014v2-abstract-full').style.display = 'none'; document.getElementById('2006.09014v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 125, 153202 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.10820">arXiv:2005.10820</a> <span> [<a href="https://arxiv.org/pdf/2005.10820">pdf</a>, <a href="https://arxiv.org/format/2005.10820">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41557-020-00610-0">10.1038/s41557-020-00610-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> State-to-state control of ultracold molecular reactions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hu%2C+M">Ming-Guang Hu</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+Y">Yu Liu</a>, <a href="/search/physics?searchtype=author&query=Nichols%2C+M+A">Matthew A. Nichols</a>, <a href="/search/physics?searchtype=author&query=Zhu%2C+L">Lingbang Zhu</a>, <a href="/search/physics?searchtype=author&query=Qu%C3%A9m%C3%A9ner%2C+G">Goulven Qu茅m茅ner</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Ni%2C+K">Kang-Kuen Ni</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2005.10820v2-abstract-short" style="display: inline;"> Quantum control of reactive systems has enabled microscopic probes of underlying interaction potentials, the opening of novel reaction pathways, and the alteration of reaction rates using quantum statistics. However, extending such control to the quantum states of reaction outcomes remains challenging. In this work, we realize this goal through the nuclear spin degree of freedom, a result which re… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.10820v2-abstract-full').style.display = 'inline'; document.getElementById('2005.10820v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.10820v2-abstract-full" style="display: none;"> Quantum control of reactive systems has enabled microscopic probes of underlying interaction potentials, the opening of novel reaction pathways, and the alteration of reaction rates using quantum statistics. However, extending such control to the quantum states of reaction outcomes remains challenging. In this work, we realize this goal through the nuclear spin degree of freedom, a result which relies on the conservation of nuclear spins throughout the reaction. Using resonance-enhanced multiphoton ionization spectroscopy to investigate the products formed in bimolecular reactions between ultracold KRb molecules, we find that the system retains a near-perfect memory of the reactants' nuclear spins, manifested as a strong parity preference for the rotational states of the products. We leverage this effect to alter the occupation of these product states by changing the coherent superposition of initial nuclear spin states with an external magnetic field. In this way, we are able to control both the inputs and outputs of a bimolecular reaction with quantum state resolution. The techniques demonstrated here open up the possibilities to study quantum interference between reaction pathways, quantum entanglement between reaction products, and ultracold reaction dynamics at the state-to-state level. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.10820v2-abstract-full').style.display = 'none'; document.getElementById('2005.10820v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures in main text; Accepted for publication in Nature Chemistry</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nat. Chem. 13, 435 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.09338">arXiv:2005.09338</a> <span> [<a href="https://arxiv.org/pdf/2005.09338">pdf</a>, <a href="https://arxiv.org/format/2005.09338">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevResearch.3.013196">10.1103/PhysRevResearch.3.013196 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Life and death of a cold BaRb$^+$ molecule inside an ultracold cloud of Rb atoms </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mohammadi%2C+A">Amir Mohammadi</a>, <a href="/search/physics?searchtype=author&query=Kr%C3%BCkow%2C+A">Artjom Kr眉kow</a>, <a href="/search/physics?searchtype=author&query=Mahdian%2C+A">Amir Mahdian</a>, <a href="/search/physics?searchtype=author&query=Dei%C3%9F%2C+M">Markus Dei脽</a>, <a href="/search/physics?searchtype=author&query=P%C3%A9rez-R%C3%ADos%2C+J">Jes煤s P茅rez-R铆os</a>, <a href="/search/physics?searchtype=author&query=Silva%2C+H+d">Humberto da Silva Jr.</a>, <a href="/search/physics?searchtype=author&query=Raoult%2C+M">Maurice Raoult</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Denschlag%2C+J+H">Johannes Hecker Denschlag</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2005.09338v1-abstract-short" style="display: inline;"> We study the evolution of a single BaRb$^+$ molecule while it continuously collides with ultracold Rb atoms. The initially weakly-bound molecule can undergo a sequence of elastic, inelastic, reactive, and radiative processes. We investigate these processes by developing methods for discriminating between different ion species, electronic states, and kinetic ion energy ranges. By comparing the meas… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.09338v1-abstract-full').style.display = 'inline'; document.getElementById('2005.09338v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.09338v1-abstract-full" style="display: none;"> We study the evolution of a single BaRb$^+$ molecule while it continuously collides with ultracold Rb atoms. The initially weakly-bound molecule can undergo a sequence of elastic, inelastic, reactive, and radiative processes. We investigate these processes by developing methods for discriminating between different ion species, electronic states, and kinetic ion energy ranges. By comparing the measurements to model calculations we obtain a consistent description of the typical trajectory of the ion through the manifold of available atomic and molecular states. As a further result, we determine rates for collisional and radiative relaxation as well as photodissociation, spin-flip collisions, and chemical reactions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.09338v1-abstract-full').style.display = 'none'; document.getElementById('2005.09338v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 17 figures, 2 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Research 3, 013196 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.09102">arXiv:2005.09102</a> <span> [<a href="https://arxiv.org/pdf/2005.09102">pdf</a>, <a href="https://arxiv.org/ps/2005.09102">ps</a>, <a href="https://arxiv.org/format/2005.09102">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.101.052702">10.1103/PhysRevA.101.052702 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Interaction potentials and ultracold scattering cross sections for the $^7$Li$^+$-$^7$Li ion-atom system </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Pandey%2C+A">A. Pandey</a>, <a href="/search/physics?searchtype=author&query=Niranjan%2C+M">M. Niranjan</a>, <a href="/search/physics?searchtype=author&query=Joshi%2C+N">N. Joshi</a>, <a href="/search/physics?searchtype=author&query=Rangwala%2C+S+A">S. A. Rangwala</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">R. Vexiau</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">O. Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2005.09102v1-abstract-short" style="display: inline;"> We calculate the isotope independent Li$^+$-Li potential energy curves for the electronic ground and first excited states. Scattering phase shifts and total scattering cross section for the $^7$Li$^+$-$^7$Li collision are calculated with emphasis on the ultra-low energy domain down to the $s$-wave regime. The effect of physically motivated alterations on the calculated potential energy curves is u… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.09102v1-abstract-full').style.display = 'inline'; document.getElementById('2005.09102v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.09102v1-abstract-full" style="display: none;"> We calculate the isotope independent Li$^+$-Li potential energy curves for the electronic ground and first excited states. Scattering phase shifts and total scattering cross section for the $^7$Li$^+$-$^7$Li collision are calculated with emphasis on the ultra-low energy domain down to the $s$-wave regime. The effect of physically motivated alterations on the calculated potential energy curves is used to determine the bound of accuracy of the low-energy scattering parameters for the ion-atom system. It is found that the scattering length for the A$^2危_u^+$ state, $a_u$ = 1325 a$_0$, is positive and has well-constrained bounds. For the X$^2危_g^+$ state, the scattering length, $a_g$ = 20465 a$_0$ has a large magnitude as it is sensitive to the restrained change of the potential, due to the presence of a vibrational state in the vicinity of the dissociation limit. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.09102v1-abstract-full').style.display = 'none'; document.getElementById('2005.09102v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 7 figures, 4 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 101, 052702 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.04263">arXiv:1910.04263</a> <span> [<a href="https://arxiv.org/pdf/1910.04263">pdf</a>, <a href="https://arxiv.org/format/1910.04263">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6455/ab6053">10.1088/1361-6455/ab6053 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Product-state distribution after isotopic substitution in ultracold atom-molecule collisions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Kosicki%2C+M+B">Maciej B. Kosicki</a>, <a href="/search/physics?searchtype=author&query=%C5%BBuchowski%2C+P+S">Piotr S. 呕uchowski</a>, <a href="/search/physics?searchtype=author&query=Gonz%C3%A1lez-Mart%C3%ADnez%2C+M+L">Maykel L. Gonz谩lez-Mart铆nez</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.04263v1-abstract-short" style="display: inline;"> We show that products of the isotopic substitution reactions in experimentally accessible molecules such as NaK, RbCs, and SrF are cold according to their translational energy below hundreds of mK. For these chemical reactions, molecular products may occupy only the lowest rotational states. We also discuss the possibility of controlling the chemical reactions by the electric field in ultracold mi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.04263v1-abstract-full').style.display = 'inline'; document.getElementById('1910.04263v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.04263v1-abstract-full" style="display: none;"> We show that products of the isotopic substitution reactions in experimentally accessible molecules such as NaK, RbCs, and SrF are cold according to their translational energy below hundreds of mK. For these chemical reactions, molecular products may occupy only the lowest rotational states. We also discuss the possibility of controlling the chemical reactions by the electric field in ultracold mixtures of molecules and atoms with low kinetic energy release, where one of the constituent atoms of colliding molecule is replaced by its isotope. This letter opens new avenues in investigating the branching ratios of chemical reactions in ultracold conditions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.04263v1-abstract-full').style.display = 'none'; document.getElementById('1910.04263v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.13628">arXiv:1907.13628</a> <span> [<a href="https://arxiv.org/pdf/1907.13628">pdf</a>, <a href="https://arxiv.org/format/1907.13628">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1126/science.aay9531">10.1126/science.aay9531 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct observation of bimolecular reactions of ultracold KRb molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hu%2C+M">Ming-Guang Hu</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+Y">Yu Liu</a>, <a href="/search/physics?searchtype=author&query=Grimes%2C+D+D">David D. Grimes</a>, <a href="/search/physics?searchtype=author&query=Lin%2C+Y">Yen-Wei Lin</a>, <a href="/search/physics?searchtype=author&query=Gheorghe%2C+A+H">Andrei H. Gheorghe</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">Romain Vexiau</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">Nadia Bouloufa-Maafa</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Rosenband%2C+T">Till Rosenband</a>, <a href="/search/physics?searchtype=author&query=Ni%2C+K">Kang-Kuen Ni</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1907.13628v2-abstract-short" style="display: inline;"> Femtochemistry techniques have been instrumental in accessing the short time scales necessary to probe transient intermediates in chemical reactions. Here we take the contrasting approach of prolonging the lifetime of an intermediate by preparing reactant molecules in their lowest ro-vibronic quantum state at ultralow temperatures, thereby drastically reducing the number of exit channels accessibl… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.13628v2-abstract-full').style.display = 'inline'; document.getElementById('1907.13628v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.13628v2-abstract-full" style="display: none;"> Femtochemistry techniques have been instrumental in accessing the short time scales necessary to probe transient intermediates in chemical reactions. Here we take the contrasting approach of prolonging the lifetime of an intermediate by preparing reactant molecules in their lowest ro-vibronic quantum state at ultralow temperatures, thereby drastically reducing the number of exit channels accessible upon their mutual collision. Using ionization spectroscopy and velocity-map imaging of a trapped gas of potassium-rubidium molecules at a temperature of 500~nK, we directly observe reactants, intermediates, and products of the reaction $^{40}$K$^{87}$Rb + $^{40}$K$^{87}$Rb $\rightarrow$ K$_2$Rb$^*_2$ $\rightarrow$ K$_2$ + Rb$_2$. Beyond observation of a long-lived energy-rich intermediate complex, this technique opens the door to further studies of quantum-state resolved reaction dynamics in the ultracold regime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.13628v2-abstract-full').style.display = 'none'; document.getElementById('1907.13628v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 figures in main, 4 figures in SM, 2 table in SM</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science 366, 1111-1115 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.06736">arXiv:1907.06736</a> <span> [<a href="https://arxiv.org/pdf/1907.06736">pdf</a>, <a href="https://arxiv.org/format/1907.06736">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.102.031301">10.1103/PhysRevA.102.031301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Strong angular-momentum mixing in ultracold atom-ion excitation-exchange </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ben-Shlomi%2C+R">Ruti Ben-Shlomi</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">Romain Vexiau</a>, <a href="/search/physics?searchtype=author&query=Meir%2C+Z">Ziv Meir</a>, <a href="/search/physics?searchtype=author&query=Sikorsky%2C+T">Tomas Sikorsky</a>, <a href="/search/physics?searchtype=author&query=Akerman%2C+N">Nitzan Akerman</a>, <a href="/search/physics?searchtype=author&query=Pinkas%2C+M">Meirav Pinkas</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Ozeri%2C+R">Roee Ozeri</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1907.06736v1-abstract-short" style="display: inline;"> Atom-ion interactions occur through the electric dipole which is induced by the ion on the neutral atom. In a Langevin collision, in which the atom and ion overcome the centrifugal barrier and reach a short internuclear distance, their internal electronic states deform due to their interaction and can eventually alter. Here we explore the outcome products and the energy released from a single Lang… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.06736v1-abstract-full').style.display = 'inline'; document.getElementById('1907.06736v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.06736v1-abstract-full" style="display: none;"> Atom-ion interactions occur through the electric dipole which is induced by the ion on the neutral atom. In a Langevin collision, in which the atom and ion overcome the centrifugal barrier and reach a short internuclear distance, their internal electronic states deform due to their interaction and can eventually alter. Here we explore the outcome products and the energy released from a single Langevin collision between a single cold $^{88}$Sr$^{+}$ ion initialized in the metastable $4d^2D_{5/2,3/2}$ states, and a cold $^{87}$Rb atom in the $5s^2S_{1/2}$ ground state. We found that the long-lived $D_{5/2}$ and $D_{3/2}$ states quench after roughly three Langevin collisions, transforming the excitation energy into kinetic energy. We identify two types of collisional quenching. One is an Electronic Excitation-Exchange process, during which the ion relaxes to the $S$ state and the atom is excited to the $P$ state, followed by energy release of $\sim$ 3000 K$\cdot$k$_B$. The second is Spin-Orbit Change where the ion relaxes from the higher fine-structure $D_{5/2}$ level to the lower $D_{3/2}$ level releasing $\sim$ 400 K$\cdot$k$_B$ into kinetic motion. These processes are theoretically understood to occur through Landau-Zener avoided crossings between the different molecular potential curves. We also found that these relaxation rates are insensitive to the mutual spin orientation of the ion and atoms. This is explained by the strong inertial Coriolis coupling present in ultracold atom-ion collisions due to the high partial wave involved, which strongly mixes different angular momentum states. This inertial coupling explains the loss of the total electronic angular-momentum which is transferred to the external rotation of nuclei. Our results provide deeper understanding of ultracold atom-ion inelastic collisions and offer additional quantum control tools for the cold chemistry field. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.06736v1-abstract-full').style.display = 'none'; document.getElementById('1907.06736v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 102, 031301 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.03853">arXiv:1907.03853</a> <span> [<a href="https://arxiv.org/pdf/1907.03853">pdf</a>, <a href="https://arxiv.org/format/1907.03853">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.100.042711">10.1103/PhysRevA.100.042711 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Purely long-range polar molecules composed of identical lanthanide atoms </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Li%2C+H">Hui Li</a>, <a href="/search/physics?searchtype=author&query=Qu%C3%A9m%C3%A9ner%2C+G">Goulven Qu茅m茅ner</a>, <a href="/search/physics?searchtype=author&query=Wyart%2C+J">Jean-Fran莽ois Wyart</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Lepers%2C+M">Maxence Lepers</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1907.03853v1-abstract-short" style="display: inline;"> Doubly polar molecules, possessing an electric dipole moment and a magnetic dipole moment, can strongly couple to both an external electric field and a magnetic field, providing unique opportunities to exert full control of the system quantum state at ultracold temperatures. We propose a method for creating a purely long-range doubly polar homonuclear molecule from a pair of strongly magnetic lant… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.03853v1-abstract-full').style.display = 'inline'; document.getElementById('1907.03853v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.03853v1-abstract-full" style="display: none;"> Doubly polar molecules, possessing an electric dipole moment and a magnetic dipole moment, can strongly couple to both an external electric field and a magnetic field, providing unique opportunities to exert full control of the system quantum state at ultracold temperatures. We propose a method for creating a purely long-range doubly polar homonuclear molecule from a pair of strongly magnetic lanthanide atoms, one atom being in its ground level and the other in a superposition of quasi-degenerate opposite-parity excited levels [Phys.~Rev.~Lett.~\textbf{121}, 063201 (2018)]. The electric dipole moment is induced by coupling the excited levels with an external electric field. We derive the general expression of the long-range, Stark, and Zeeman interaction energies in the properly symmetrized and fully-coupled basis describing the diatomic complex. Taking the example of holmium, our calculations predict shallow long-range wells in the potential energy curves that may support vibrational levels accessible by direct photoassociation from pairs of ground-level atoms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.03853v1-abstract-full').style.display = 'none'; document.getElementById('1907.03853v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> 04 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 100, 042711 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1806.10346">arXiv:1806.10346</a> <span> [<a href="https://arxiv.org/pdf/1806.10346">pdf</a>, <a href="https://arxiv.org/format/1806.10346">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.98.053411">10.1103/PhysRevA.98.053411 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Proposal for the formation of ultracold deeply-bound RbSr dipolar molecules by all-optical methods </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Devolder%2C+A">Adrien Devolder</a>, <a href="/search/physics?searchtype=author&query=Luc-Koenig%2C+E">Eliane Luc-Koenig</a>, <a href="/search/physics?searchtype=author&query=Atabek%2C+O">Osman Atabek</a>, <a href="/search/physics?searchtype=author&query=Desouter-Lecomte%2C+M">Mich猫le Desouter-Lecomte</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1806.10346v1-abstract-short" style="display: inline;"> Ultracold paramagnetic and polar diatomic molecules are among the promising systems for quantum simulation of lattice-spin models. Unfortunately, their experimental observation is still challenging. Based on our recent \textit{ab-initio} calculations, we analyze the feasibility of all-optical schemes for the formation of ultracold $^{87}$Rb$^{84}$Sr bosonic molecules. First, we have studied the fo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.10346v1-abstract-full').style.display = 'inline'; document.getElementById('1806.10346v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1806.10346v1-abstract-full" style="display: none;"> Ultracold paramagnetic and polar diatomic molecules are among the promising systems for quantum simulation of lattice-spin models. Unfortunately, their experimental observation is still challenging. Based on our recent \textit{ab-initio} calculations, we analyze the feasibility of all-optical schemes for the formation of ultracold $^{87}$Rb$^{84}$Sr bosonic molecules. First, we have studied the formation by photoassociation followed by spontaneous emission. The photoassociation rates to levels belonging to electronic states converging to the $^{87}$Rb$(5s\,^2S)$+$^{84}$Sr($5s5p\,^3P_{0,1,2}$) asymptotes are particularly small close to the asymptote. The creation of molecules would be more interesting by using deeply levels that preferentially relaxes to the $v''=0$ level of the ground state. On the other hands, the photoassociation rates to levels belonging to electronic states converging to the Rb$(5p\,^2P_{1/2,3/2})$+Sr($5s^2\,^1S$) asymptotes have high value close to the asymptote. The relaxation from the levels close to the asymptotes creates weakly-bound molecules in mosty only one vibrational level. Second, stimulated Raman adiabatic passage (STIRAP) achieved in a tight optical trap efficiently creates weakly-bound ground-state molecules in a well-defined level, thus providing an alternative to magnetic Feshbach resonances to implement several schemes for an adiabatic population transfer toward the lowest ground-state level of RbSr. Finally, we have studied STIRAP process for transferring the weakly-bound molecules into the $v''=0$ level of the RbSr ground state. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.10346v1-abstract-full').style.display = 'none'; document.getElementById('1806.10346v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 12 figures, 6 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 98, 053411 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1806.08314">arXiv:1806.08314</a> <span> [<a href="https://arxiv.org/pdf/1806.08314">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-018-07292-w">10.1038/s41467-018-07292-w <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Coherent multidimensional spectroscopy of dilute gas-phase nanosystems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bruder%2C+L">Lukas Bruder</a>, <a href="/search/physics?searchtype=author&query=Bangert%2C+U">Ulrich Bangert</a>, <a href="/search/physics?searchtype=author&query=Binz%2C+M">Marcel Binz</a>, <a href="/search/physics?searchtype=author&query=Uhl%2C+D">Daniel Uhl</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">Romain Vexiau</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">Nadia Bouloufa-Maafa</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Stienkemeier%2C+F">Frank Stienkemeier</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1806.08314v1-abstract-short" style="display: inline;"> Two-dimensional electronic spectroscopy (2DES) is one of the most powerful spectroscopic techniques, capable of attaining a nearly complete picture of a quantum system including its couplings, quantum coherence properties and its real-time dynamics. While successfully applied to a variety of condensed phase samples, high precision experiments on isolated quantum systems in the gas phase have been… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.08314v1-abstract-full').style.display = 'inline'; document.getElementById('1806.08314v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1806.08314v1-abstract-full" style="display: none;"> Two-dimensional electronic spectroscopy (2DES) is one of the most powerful spectroscopic techniques, capable of attaining a nearly complete picture of a quantum system including its couplings, quantum coherence properties and its real-time dynamics. While successfully applied to a variety of condensed phase samples, high precision experiments on isolated quantum systems in the gas phase have been so far precluded by insufficient sensitivity. However, such experiments are essential for a precise understanding of fundamental mechanisms and to avoid misinterpretations, e.g. as for the nature of quantum coherences in energy trans-port. Here, we solve this issue by extending 2DES to isolated nanosystems in the gas phase prepared by helium nanodroplet isolation in a molecular beam-type experiment. This approach uniquely provides high flexibility in synthesizing tailored, quantum state-selected model systems of single and many-body properties. For demonstration, we deduce a precise and conclusive picture of the ultrafast coherent dynamics in isolated high-spin Rb2 molecules and present for the first time a dynamics study of the system-bath interaction between a single molecule (here Rb3) and a superfluid helium environment. The results demonstrate the unique capacity to elucidate prototypical interactions and dynamics in tailored quantum systems and bridges the gap to experiments in ultracold quantum science. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.08314v1-abstract-full').style.display = 'none'; document.getElementById('1806.08314v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nat Commun 9, 4823 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1805.06878">arXiv:1805.06878</a> <span> [<a href="https://arxiv.org/pdf/1805.06878">pdf</a>, <a href="https://arxiv.org/format/1805.06878">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.98.040502">10.1103/PhysRevA.98.040502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Anisotropic light-shift and magic-polarization of the intercombination line of Dysprosium atoms in a far-detuned dipole trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Chalopin%2C+T">Thomas Chalopin</a>, <a href="/search/physics?searchtype=author&query=Makhalov%2C+V">Vasiliy Makhalov</a>, <a href="/search/physics?searchtype=author&query=Bouazza%2C+C">Chayma Bouazza</a>, <a href="/search/physics?searchtype=author&query=Evrard%2C+A">Alexandre Evrard</a>, <a href="/search/physics?searchtype=author&query=Barker%2C+A">Adam Barker</a>, <a href="/search/physics?searchtype=author&query=Lepers%2C+M">Maxence Lepers</a>, <a href="/search/physics?searchtype=author&query=Wyart%2C+J">Jean-Fran莽ois Wyart</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Dalibard%2C+J">Jean Dalibard</a>, <a href="/search/physics?searchtype=author&query=Lopes%2C+R">Raphael Lopes</a>, <a href="/search/physics?searchtype=author&query=Nascimbene%2C+S">Sylvain Nascimbene</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1805.06878v2-abstract-short" style="display: inline;"> We characterize the anisotropic differential ac-Stark shift for the Dy $626$ nm intercombination transition, induced in a far-detuned $1070$ nm optical dipole trap, and observe the existence of a "magic polarization" for which the polarizabilities of the ground and excited states are equal. From our measurements we extract both the scalar and tensorial components of the dynamic dipole polarizabili… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.06878v2-abstract-full').style.display = 'inline'; document.getElementById('1805.06878v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1805.06878v2-abstract-full" style="display: none;"> We characterize the anisotropic differential ac-Stark shift for the Dy $626$ nm intercombination transition, induced in a far-detuned $1070$ nm optical dipole trap, and observe the existence of a "magic polarization" for which the polarizabilities of the ground and excited states are equal. From our measurements we extract both the scalar and tensorial components of the dynamic dipole polarizability for the excited state, $伪_E^\text{s} = 188 (12)\,伪_\text{0}$ and $伪_E^\text{t} = 34 (12)\,伪_\text{0}$, respectively, where $伪_\text{0}$ is the atomic unit for the electric polarizability. We also provide a theoretical model allowing us to predict the excited state polarizability and find qualitative agreement with our observations. Furthermore, we utilize our findings to optimize the efficiency of Doppler cooling of a trapped gas, by controlling the sign and magnitude of the inhomogeneous broadening of the optical transition. The resulting initial gain of the collisional rate allows us, after forced evaporation cooling, to produce a quasi-pure Bose-Einstein condensate of $^{162}$Dy with $3\times 10^4$ atoms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.06878v2-abstract-full').style.display = 'none'; document.getElementById('1805.06878v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 98, 040502 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1803.04159">arXiv:1803.04159</a> <span> [<a href="https://arxiv.org/pdf/1803.04159">pdf</a>, <a href="https://arxiv.org/ps/1803.04159">ps</a>, <a href="https://arxiv.org/format/1803.04159">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.121.063201">10.1103/PhysRevLett.121.063201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ultracold rare-earth magnetic atoms with an electric dipole moment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lepers%2C+M">Maxence Lepers</a>, <a href="/search/physics?searchtype=author&query=Li%2C+H">Hui Li</a>, <a href="/search/physics?searchtype=author&query=Wyart%2C+J">Jean-Fran莽ois Wyart</a>, <a href="/search/physics?searchtype=author&query=Qu%C3%A9m%C3%A9ner%2C+G">Goulven Qu茅m茅ner</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1803.04159v1-abstract-short" style="display: inline;"> We propose a new method to produce an electric and magnetic dipolar gas of ultracold dysprosium atoms. The pair of nearly degenerate energy levels of opposite parity, at 17513.33 cm$^{-1}$ with electronic angular momentum $J=10$, and at 17514.50 cm$^{-1}$ with $J=9$, can be mixed with an external electric field, thus inducing an electric dipole moment in the laboratory frame. For field amplitudes… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.04159v1-abstract-full').style.display = 'inline'; document.getElementById('1803.04159v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1803.04159v1-abstract-full" style="display: none;"> We propose a new method to produce an electric and magnetic dipolar gas of ultracold dysprosium atoms. The pair of nearly degenerate energy levels of opposite parity, at 17513.33 cm$^{-1}$ with electronic angular momentum $J=10$, and at 17514.50 cm$^{-1}$ with $J=9$, can be mixed with an external electric field, thus inducing an electric dipole moment in the laboratory frame. For field amplitudes relevant to current-day experiments, we predict a magnetic dipole moment up to 13 Bohr magnetons, and an electric dipole moment up to 0.22 Debye, which is similar to the values obtained for alkali-metal diatomics. When a magnetic field is present, we show that the electric dipole moment is strongly dependent on the angle between the fields. The lifetime of the field-mixed levels is found in the millisecond range, thus allowing for suitable experimental detection and manipulation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.04159v1-abstract-full').style.display = 'none'; document.getElementById('1803.04159v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 March, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 3 figures, 1 table</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 121, 063201 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.10343">arXiv:1802.10343</a> <span> [<a href="https://arxiv.org/pdf/1802.10343">pdf</a>, <a href="https://arxiv.org/format/1802.10343">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.97.063405">10.1103/PhysRevA.97.063405 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Detection of ultracold molecules using an optical cavity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sawant%2C+R">Rahul Sawant</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Rangwala%2C+S+A">S. A. Rangwala</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1802.10343v1-abstract-short" style="display: inline;"> We theoretically study non-destructive detection of ultracold molecules, using a Fabry-Perot cavity. Specifically, we consider vacuum Rabi splitting where we demonstrate the use of collective strong coupling for detection of molecules with many participating energy levels. We also consider electromagnetically induced transparency and transient response of light for the molecules interacting with a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.10343v1-abstract-full').style.display = 'inline'; document.getElementById('1802.10343v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.10343v1-abstract-full" style="display: none;"> We theoretically study non-destructive detection of ultracold molecules, using a Fabry-Perot cavity. Specifically, we consider vacuum Rabi splitting where we demonstrate the use of collective strong coupling for detection of molecules with many participating energy levels. We also consider electromagnetically induced transparency and transient response of light for the molecules interacting with a Fabry-Perot cavity mode, as a mean for non-destructive detection. We identify the parameters that are required for the detection of molecules in the cavity electromagnetically induced transparency configuration. The theoretical analysis for these processes is parametrized with realistic values of both, the molecule and the cavity. For each process, we quantify the state occupancy of the molecules interacting with the cavity and determine to what extent the population does not change during a detection cycle. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.10343v1-abstract-full').style.display = 'none'; document.getElementById('1802.10343v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 97, 063405 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.05514">arXiv:1802.05514</a> <span> [<a href="https://arxiv.org/pdf/1802.05514">pdf</a>, <a href="https://arxiv.org/ps/1802.05514">ps</a>, <a href="https://arxiv.org/format/1802.05514">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.jqsrt.2018.02.020">10.1016/j.jqsrt.2018.02.020 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Experimental and theoretical study of the B(2)$^2 危^+ \rightarrow$ X(1)$^2 危^+$ system in the KSr molecule </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Szczepkowski%2C+J">Jacek Szczepkowski</a>, <a href="/search/physics?searchtype=author&query=Grochola%2C+A">Anna Grochola</a>, <a href="/search/physics?searchtype=author&query=Kowalczyk%2C+P">Pawe艂 Kowalczyk</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Guerout%2C+R">Romain Guerout</a>, <a href="/search/physics?searchtype=author&query=%C5%BBuchowski%2C+P+S">Piotr S. 呕uchowski</a>, <a href="/search/physics?searchtype=author&query=Jastrzebski%2C+W">W艂odzimierz Jastrzebski</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1802.05514v1-abstract-short" style="display: inline;"> Spectral bands for the B(2)$^{2}危^{+}\rightarrow$ X(1)$^{2}危^{+}$ electronic transition in the doubly-polar open-shell KSr molecule are recorded at moderate resolution using the thermoluminescence technique. The spectra are simulated using three kinds of advanced electronic structure calculations, allowing for an assessment of their accuracy on one hand, and for the derivation of fundamental spect… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.05514v1-abstract-full').style.display = 'inline'; document.getElementById('1802.05514v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.05514v1-abstract-full" style="display: none;"> Spectral bands for the B(2)$^{2}危^{+}\rightarrow$ X(1)$^{2}危^{+}$ electronic transition in the doubly-polar open-shell KSr molecule are recorded at moderate resolution using the thermoluminescence technique. The spectra are simulated using three kinds of advanced electronic structure calculations, allowing for an assessment of their accuracy on one hand, and for the derivation of fundamental spectroscopic constants of the X(1)$^{2}危^{+}$ KSr ground state and the excited electronic state B(2)$^{2}危^{+}$, on the other hand. These results should facilitate further studies aiming at creating ultracold bosonic or fermionic KSr molecules. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.05514v1-abstract-full').style.display = 'none'; document.getElementById('1802.05514v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 figures, 3 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1710.07162">arXiv:1710.07162</a> <span> [<a href="https://arxiv.org/pdf/1710.07162">pdf</a>, <a href="https://arxiv.org/format/1710.07162">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.97.012509">10.1103/PhysRevA.97.012509 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Anisotropic polarizability of erbium atoms </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Becher%2C+J+H">Jan Hendrik Becher</a>, <a href="/search/physics?searchtype=author&query=Baier%2C+S">Simon Baier</a>, <a href="/search/physics?searchtype=author&query=Aikawa%2C+K">Kiyotaka Aikawa</a>, <a href="/search/physics?searchtype=author&query=Lepers%2C+M">Maxence Lepers</a>, <a href="/search/physics?searchtype=author&query=Wyart%2C+J">Jean-Fran莽ois Wyart</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Ferlaino%2C+F">Francesca Ferlaino</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1710.07162v2-abstract-short" style="display: inline;"> We report on the determination of the dynamical polarizability of ultracold erbium atoms in the ground and in one excited state at three different wavelengths, which are particularly relevant for optical trapping. Our study combines experimental measurements of the light shift and theoretical calculations. In particular, our experimental approach allows us to isolate the different contributions to… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.07162v2-abstract-full').style.display = 'inline'; document.getElementById('1710.07162v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1710.07162v2-abstract-full" style="display: none;"> We report on the determination of the dynamical polarizability of ultracold erbium atoms in the ground and in one excited state at three different wavelengths, which are particularly relevant for optical trapping. Our study combines experimental measurements of the light shift and theoretical calculations. In particular, our experimental approach allows us to isolate the different contributions to the polarizability, namely the isotropic scalar and anisotropic tensor part. For the latter contribution, we observe a clear dependence of the atomic polarizability on the angle between the laser-field-polarization axis and the quantization axis, set by the external magnetic field. Such an angle-dependence is particularly pronounced in the excited-state polarizability. We compare our experimental findings with the theoretical values, based on semi-empirical electronic-structure calculations and we observe a very good overall agreement. Our results pave the way to exploit the anisotropy of the tensor polarizability for spin-selective preparation and manipulation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.07162v2-abstract-full').style.display = 'none'; document.getElementById('1710.07162v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 97, 012509 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1710.04883">arXiv:1710.04883</a> <span> [<a href="https://arxiv.org/pdf/1710.04883">pdf</a>, <a href="https://arxiv.org/format/1710.04883">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.96.052505">10.1103/PhysRevA.96.052505 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High Resolution Molecular Spectroscopy for Producing Ultracold Absolute Ground-State $^{23}$Na$^{87}$Rb Molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Guo%2C+M">Mingyang Guo</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">Romain Vexiau</a>, <a href="/search/physics?searchtype=author&query=Zhu%2C+B">Bing Zhu</a>, <a href="/search/physics?searchtype=author&query=Lu%2C+B">Bo Lu</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">Nadia Bouloufa-Maafa</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+D">Dajun Wang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1710.04883v1-abstract-short" style="display: inline;"> We report a detailed molecular spectroscopy study on the lowest excited electronic states of $^{23}\rm{Na}^{87}\rm{Rb}$ for producing ultracold $^{23}\rm{Na}^{87}\rm{Rb}$ molecules in the electronic, rovibrational and hyperfine ground state. Starting from weakly-bound Feshbach molecules, a series of vibrational levels of the $A^{1}危^{+}-b^{3}螤$ coupled excited states were investigated. After resol… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.04883v1-abstract-full').style.display = 'inline'; document.getElementById('1710.04883v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1710.04883v1-abstract-full" style="display: none;"> We report a detailed molecular spectroscopy study on the lowest excited electronic states of $^{23}\rm{Na}^{87}\rm{Rb}$ for producing ultracold $^{23}\rm{Na}^{87}\rm{Rb}$ molecules in the electronic, rovibrational and hyperfine ground state. Starting from weakly-bound Feshbach molecules, a series of vibrational levels of the $A^{1}危^{+}-b^{3}螤$ coupled excited states were investigated. After resolving, modeling and interpreting the hyperfine structure of several lines, we successfully identified a long-lived level resulting from the accidental hyperfine coupling between the $0^+$ and $0^-$ components of the $b^3螤$ state, satisfying all the requirements for the population transfer toward the lowest rovibrational level of the X$^1危^+$ state. Using two-photon spectroscopy, its binding energy was measured to be 4977.308(3) cm$^{-1}$, the most precise value to date. We calibrated all the transition strengths carefully and also demonstrated Raman transfer of Feshbach molecules to the absolute ground state. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.04883v1-abstract-full').style.display = 'none'; document.getElementById('1710.04883v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 96, 052505 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1707.02168">arXiv:1707.02168</a> <span> [<a href="https://arxiv.org/pdf/1707.02168">pdf</a>, <a href="https://arxiv.org/format/1707.02168">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> </div> <p class="title is-5 mathjax"> Dynamic dipole polarizabilities of heteronuclear alkali dimers: optical response, trapping and control of ultracold molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">R. Vexiau</a>, <a href="/search/physics?searchtype=author&query=Borsalino%2C+D">D. Borsalino</a>, <a href="/search/physics?searchtype=author&query=Lepers%2C+M">M. Lepers</a>, <a href="/search/physics?searchtype=author&query=Orb%C3%A1n%2C+A">A. Orb谩n</a>, <a href="/search/physics?searchtype=author&query=Aymar%2C+M">M. Aymar</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">O. Dulieu</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">N. Bouloufa-Maafa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1707.02168v1-abstract-short" style="display: inline;"> In this article we address the general approach for calculating dynamical dipole polarizabilities of small quantum systems, based on a sum-over-states formula involving in principle the entire energy spectrum of the system. We complement this method by a few-parameter model involving a limited number of effective transitions, allowing for a compact and accurate representation of both the isotropic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.02168v1-abstract-full').style.display = 'inline'; document.getElementById('1707.02168v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1707.02168v1-abstract-full" style="display: none;"> In this article we address the general approach for calculating dynamical dipole polarizabilities of small quantum systems, based on a sum-over-states formula involving in principle the entire energy spectrum of the system. We complement this method by a few-parameter model involving a limited number of effective transitions, allowing for a compact and accurate representation of both the isotropic and anisotropic components of the polarizability. We apply the method to the series of ten heteronuclear molecules composed of two of ($^7$Li,$^{23}$Na,$^{39}$K,$^{87}$Rb,$^{133}$Cs) alkali-metal atoms. We rely on both up-to-date spectroscopically-determined potential energy curves for the lowest electronic states, and on our systematic studies of these systems performed during the last decade for higher excited states and for permanent and transition dipole moments. Such a compilation is timely for the continuously growing researches on ultracold polar molecules. Indeed the knowledge of the dynamic dipole polarizabilities is crucial to model the optical response of molecules when trapped in optical lattices, and to determine optimal lattice frequencies ensuring optimal transfer to the absolute ground state of initially weakly-bound molecules. When they exist, we determine the so-called "magic frequencies" where the ac-Stark shift and thus the viewed trap depth, is the same for both weakly-bound and ground-state molecules. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.02168v1-abstract-full').style.display = 'none'; document.getElementById('1707.02168v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 July, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted in International Reviews of Physical Chemistry</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1704.04134">arXiv:1704.04134</a> <span> [<a href="https://arxiv.org/pdf/1704.04134">pdf</a>, <a href="https://arxiv.org/ps/1704.04134">ps</a>, <a href="https://arxiv.org/format/1704.04134">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.95.062508">10.1103/PhysRevA.95.062508 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Anisotropic optical trapping as a manifestation of the complex electronic structure of ultracold lanthanide atoms: the example of holmium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Li%2C+H">Hui Li</a>, <a href="/search/physics?searchtype=author&query=Wyart%2C+J">Jean-Fran莽ois Wyart</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Lepers%2C+M">Maxence Lepers</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1704.04134v1-abstract-short" style="display: inline;"> The efficiency of optical trapping is determined by the atomic dynamic dipole polarizability, whose real and imaginary parts are associated with the potential energy and photon-scattering rate respectively. In this article we develop a formalism to calculate analytically the real and imaginary parts of the scalar, vector and tensor polarizabilities of lanthanide atoms. We assume that the sum-over-… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.04134v1-abstract-full').style.display = 'inline'; document.getElementById('1704.04134v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1704.04134v1-abstract-full" style="display: none;"> The efficiency of optical trapping is determined by the atomic dynamic dipole polarizability, whose real and imaginary parts are associated with the potential energy and photon-scattering rate respectively. In this article we develop a formalism to calculate analytically the real and imaginary parts of the scalar, vector and tensor polarizabilities of lanthanide atoms. We assume that the sum-over-state formula only comprises transitions involving electrons in the valence orbitals like $6s$, $5d$, $6p$ or $7s$, while transitions involving $4f$ core electrons are neglected. Applying this formalism to the ground level of configuration $4f^q6s^2$, we restrict the sum to transitions implying the $4f^q6s6p$ configuration, which yields polarizabilities depending on two parameters: an effective transition energy and an effective transition dipole moment. Then, by introducing configuration-interaction mixing between $4f^q6s6p$ and other configurations, we demonstrate that the imaginary part of the scalar, vector and tensor polarizabilities is very sensitive to configuration-interaction coefficients, whereas the real part is not. The magnitude and anisotropy of the photon-scattering rate is thus strongly related to the details of the atomic electronic structure. Those analytical results agree with our detailed electronic-structure calculations of energy levels, Land茅 $g$-factors, transition probabilities, polarizabilities and van der Waals $C_6$ coefficients, previously performed on erbium and dysprosium, and presently performed on holmium. Our results show that, although the density of states decreases with increasing $q$, the configuration interaction between $4f^q6s6p$, $4f^{q-1}5d6s^2$ and $4f^{q-1}5d^26s$ is surprisingly stronger in erbium ($q=12$), than in holmium ($q=11$), itself stronger than in dysprosium ($q=10$). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.04134v1-abstract-full').style.display = 'none'; document.getElementById('1704.04134v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 95, 062508 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1703.02833">arXiv:1703.02833</a> <span> [<a href="https://arxiv.org/pdf/1703.02833">pdf</a>, <a href="https://arxiv.org/ps/1703.02833">ps</a>, <a href="https://arxiv.org/format/1703.02833">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> </div> <p class="title is-5 mathjax"> Long-range interactions between ultracold atoms and molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lepers%2C+M">Maxence Lepers</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1703.02833v2-abstract-short" style="display: inline;"> The term "long-range interactions" refers to electrostatic and magnetostatic potential energies between atoms and molecules with mutual distances ranging from a few tens to a few hundreds Bohr radii. The involved energies are much smaller than the usual chemical bond energies. However, they are comparable with the typical kinetic energies of particles in an ultracold gas ($T\ll 1K$), so that the l… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.02833v2-abstract-full').style.display = 'inline'; document.getElementById('1703.02833v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1703.02833v2-abstract-full" style="display: none;"> The term "long-range interactions" refers to electrostatic and magnetostatic potential energies between atoms and molecules with mutual distances ranging from a few tens to a few hundreds Bohr radii. The involved energies are much smaller than the usual chemical bond energies. However, they are comparable with the typical kinetic energies of particles in an ultracold gas ($T\ll 1K$), so that the long-range interactions play a central role in its dynamics. The progress of research devoted to ultracold gases shed a new light on the well-established topic of long-range interactions, because: (i) the interacting atoms and molecules can be prepared in a well-defined quantum (electronic, vibrational, rotational, fine or hyper-fine), ground or excited level; and (ii) long-range interactions can be tailored at will using external electromagnetic fields. In this chapter, we present the essential concepts and mathematical relations to calculate long-range potential energies. We start with deriving the multipolar expansion of the electrostatic interaction energy between classical charge distributions, both in Cartesian coordinates for pedagogical purpose, and in spherical coordinates for practical use. Then we combine multipolar expansion and quantum perturbation theory, to obtain the general first- and second-order energy corrections, including the well-known van der Waals energy. We consider two central examples in the current context of ultracold gases: (i) a pair of alkali-metal atoms and (ii) a pair of alkali-metal heteronuclear diatomic molecules submitted to an electric field. We highlight the key role of the total angular momenta of the interacting particles and of the complex, irrespective of their electronic or nuclear, orbital or spin nature. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.02833v2-abstract-full').style.display = 'none'; document.getElementById('1703.02833v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 March, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">57 pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1608.07043">arXiv:1608.07043</a> <span> [<a href="https://arxiv.org/pdf/1608.07043">pdf</a>, <a href="https://arxiv.org/ps/1608.07043">ps</a>, <a href="https://arxiv.org/format/1608.07043">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.95.032709">10.1103/PhysRevA.95.032709 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Characterization of charge-exchange collisions between ultracold $\rm{^6Li}$ atoms and $\rm{^{40}Ca^+}$ ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Saito%2C+R">R. Saito</a>, <a href="/search/physics?searchtype=author&query=Haze%2C+S">S. Haze</a>, <a href="/search/physics?searchtype=author&query=Sasakawa%2C+M">M. Sasakawa</a>, <a href="/search/physics?searchtype=author&query=Nakai%2C+R">R. Nakai</a>, <a href="/search/physics?searchtype=author&query=Raoult%2C+M">M. Raoult</a>, <a href="/search/physics?searchtype=author&query=Silva%2C+H+D">H. Da Silva Jr.</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">O. Dulieu</a>, <a href="/search/physics?searchtype=author&query=Mukaiyama%2C+T">T. Mukaiyama</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1608.07043v2-abstract-short" style="display: inline;"> We investigate the energy dependence and the internal-state dependence of the charge-exchange collision cross sections in a mixture of $^6$Li atoms and $^{40}$Ca$^+$ ions in the collision energy range from 0.2 mK to 1 K. Deliberately excited ion micromotion is used to control the collision energy of atoms and ions. The energy dependence of the charge-exchange collision cross section obeys the Lang… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.07043v2-abstract-full').style.display = 'inline'; document.getElementById('1608.07043v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1608.07043v2-abstract-full" style="display: none;"> We investigate the energy dependence and the internal-state dependence of the charge-exchange collision cross sections in a mixture of $^6$Li atoms and $^{40}$Ca$^+$ ions in the collision energy range from 0.2 mK to 1 K. Deliberately excited ion micromotion is used to control the collision energy of atoms and ions. The energy dependence of the charge-exchange collision cross section obeys the Langevin model in the temperature range of the current experiment, and the measured magnitude of the cross section is correlated to the internal state of the $^{40}$Ca$^+$ ions. Revealing the relationship between the charge-exchange collision cross sections and the interaction potentials is an important step toward the realization of the full quantum control of the chemical reactions at an ultralow temperature regime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.07043v2-abstract-full').style.display = 'none'; document.getElementById('1608.07043v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 August, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 95, 032709 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1608.06463">arXiv:1608.06463</a> <span> [<a href="https://arxiv.org/pdf/1608.06463">pdf</a>, <a href="https://arxiv.org/format/1608.06463">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic and Molecular Clusters">physics.atm-clus</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1021/acs.jpca.6b05732">10.1021/acs.jpca.6b05732 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Desorption Dynamics of Rb_2 Molecules off the Surface of Helium Nanodroplets </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sieg%2C+A">A. Sieg</a>, <a href="/search/physics?searchtype=author&query=von+Vangerow%2C+J">J. von Vangerow</a>, <a href="/search/physics?searchtype=author&query=Stienkemeier%2C+F">F. Stienkemeier</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">O. Dulieu</a>, <a href="/search/physics?searchtype=author&query=Mudrich%2C+M">M. Mudrich</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1608.06463v1-abstract-short" style="display: inline;"> The desorption dynamics of rubidium dimers (Rb_2) off the surface of helium nanodroplets induced by laser excitation is studied employing both nanosecond and femtosecond ion imaging spectroscopy. Similarly to alkali metal atoms, we find that the Rb_2 desorption process resembles the dissociation of a diatomic molecule. However, both angular and energy distributions of detected Rb_2^+ ions appear t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.06463v1-abstract-full').style.display = 'inline'; document.getElementById('1608.06463v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1608.06463v1-abstract-full" style="display: none;"> The desorption dynamics of rubidium dimers (Rb_2) off the surface of helium nanodroplets induced by laser excitation is studied employing both nanosecond and femtosecond ion imaging spectroscopy. Similarly to alkali metal atoms, we find that the Rb_2 desorption process resembles the dissociation of a diatomic molecule. However, both angular and energy distributions of detected Rb_2^+ ions appear to be most crucially determined by the Rb_2 intramolecular degrees of freedom rather than by those of the Rb_2He_N complex. The pump-probe dynamics of Rb_2^+ is found to be slower than that of Rb^+ pointing at a weaker effective guest-host repulsion for excited molecules than for single atoms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.06463v1-abstract-full').style.display = 'none'; document.getElementById('1608.06463v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 August, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">accepted by J. Phys. Chem. A (2016)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1607.05628">arXiv:1607.05628</a> <span> [<a href="https://arxiv.org/pdf/1607.05628">pdf</a>, <a href="https://arxiv.org/ps/1607.05628">ps</a>, <a href="https://arxiv.org/format/1607.05628">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6455/50/1/014005">10.1088/1361-6455/50/1/014005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Optical trapping of ultracold dysprosium atoms: transition probabilities, dynamic dipole polarizabilities and van der Waals $C_6$ coefficients </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Li%2C+H">Hui Li</a>, <a href="/search/physics?searchtype=author&query=Wyart%2C+J">Jean-Francois Wyart</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Nascimbene%2C+S">Sylvain Nascimbene</a>, <a href="/search/physics?searchtype=author&query=Lepers%2C+M">Maxence Lepers</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1607.05628v1-abstract-short" style="display: inline;"> The efficiency of optical trapping of ultracold atoms depend on the atomic dynamic dipole polarizability governing the atom-field interaction. In this article, we have calculated the real and imaginary parts of the dynamic dipole polarizability of dysprosium in the ground and first excited level. Due to the high electronic angular momentum of those two states, the polarizabilities possess scalar,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1607.05628v1-abstract-full').style.display = 'inline'; document.getElementById('1607.05628v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1607.05628v1-abstract-full" style="display: none;"> The efficiency of optical trapping of ultracold atoms depend on the atomic dynamic dipole polarizability governing the atom-field interaction. In this article, we have calculated the real and imaginary parts of the dynamic dipole polarizability of dysprosium in the ground and first excited level. Due to the high electronic angular momentum of those two states, the polarizabilities possess scalar, vector and tensor contributions that we have computed, on a wide range of trapping wavelengths, using the sum-over-state formula. Using the same formalism, we have also calculated the $C_6$ coefficients characterizing the van der Waals interaction between two dysprosium atoms in the two lowest levels. We have computed the energies of excited states and the transition probabilities appearing in the sums, using a combination of \textit{ab initio} and least-square-fitting techniques provided by the Cowan codes and extended in our group. Regarding the real part of the polarizability, for field frequencies far from atomic resonances, the vector and tensor contributions are two-order-of-magnitude smaller than the scalar contribution, whereas for the imaginary part, the vector and tensor contributions represent a noticeable fraction of the scalar contribution. This offers the possibility to control the decoherence and trap losses due to spontaneous emission. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1607.05628v1-abstract-full').style.display = 'none'; document.getElementById('1607.05628v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 July, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. B, 50, 014005, 2017 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1602.03947">arXiv:1602.03947</a> <span> [<a href="https://arxiv.org/pdf/1602.03947">pdf</a>, <a href="https://arxiv.org/format/1602.03947">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.116.205303">10.1103/PhysRevLett.116.205303 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Creation of an ultracold gas of ground-state $^{23}\rm{Na}^{87}\rm{Rb}$ molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Guo%2C+M">Mingyang Guo</a>, <a href="/search/physics?searchtype=author&query=Zhu%2C+B">Bing Zhu</a>, <a href="/search/physics?searchtype=author&query=Lu%2C+B">Bo Lu</a>, <a href="/search/physics?searchtype=author&query=Ye%2C+X">Xin Ye</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+F">Fudong Wang</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">Romain Vexiau</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">Nadia Bouloufa-Maafa</a>, <a href="/search/physics?searchtype=author&query=Qu%C3%A9m%C3%A9ner%2C+G">Goulven Qu茅m茅ner</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+D">Dajun Wang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1602.03947v2-abstract-short" style="display: inline;"> We report the successful production of an ultracold sample of absolute ground-state $^{23}$Na$^{87}$Rb molecules. Starting from weakly-bound Feshbach molecules formed via magneto-association, the lowest rovibrational and hyperfine level of the electronic ground state is populated following a high efficiency and high resolution two-photon Raman process. The high purity absolute ground-state samples… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1602.03947v2-abstract-full').style.display = 'inline'; document.getElementById('1602.03947v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1602.03947v2-abstract-full" style="display: none;"> We report the successful production of an ultracold sample of absolute ground-state $^{23}$Na$^{87}$Rb molecules. Starting from weakly-bound Feshbach molecules formed via magneto-association, the lowest rovibrational and hyperfine level of the electronic ground state is populated following a high efficiency and high resolution two-photon Raman process. The high purity absolute ground-state samples have up to 8000 molecules and densities of over $10^{11}$ cm$^{-3}$. By measuring the Stark shifts induced by external electric fields, we determined the permanent electric dipole moment of the absolute ground-state $^{23}$Na$^{87}$Rb and demonstrated the capability of inducing an effective dipole moment over one Debye. Bimolecular reaction between ground-state $^{23}$Na$^{87}$Rb molecules is endothermic, but we still observed a rather fast decay of the molecular sample. Our results pave the way toward investigation of ultracold molecular collisions in a fully controlled manner, and possibly to quantum gases of ultracold bosonic molecules with strong dipolar interactions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1602.03947v2-abstract-full').style.display = 'none'; document.getElementById('1602.03947v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 February, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 116, 205303 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1601.02070">arXiv:1601.02070</a> <span> [<a href="https://arxiv.org/pdf/1601.02070">pdf</a>, <a href="https://arxiv.org/format/1601.02070">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.93.012508">10.1103/PhysRevA.93.012508 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Long-range states of the NaRb molecule near the Na($3^2S_{1/2}$)+Rb($5^2P_{3/2}$) asymptote </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Zhu%2C+B">Bing Zhu</a>, <a href="/search/physics?searchtype=author&query=Li%2C+X">Xiaoke Li</a>, <a href="/search/physics?searchtype=author&query=He%2C+X">Xiaodong He</a>, <a href="/search/physics?searchtype=author&query=Guo%2C+M">Mingyang Guo</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+F">Fudong Wang</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">Romain Vexiau</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">Nadia Bouloufa-Maafa</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+D">Dajun Wang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1601.02070v1-abstract-short" style="display: inline;"> We report a high-resolution spectroscopic investigation of the long-range states of the $^{23}$Na$^{87}$Rb molecule near its Na($3^2S_{1/2}$)+Rb($5^2P_{3/2}$) asymptote. This study was performed with weakly bound ultracold molecules produced via magneto-association with an inter-species Feshbach resonance. We observed several regular vibrational series, which are assigned to the 5 attractive long-… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.02070v1-abstract-full').style.display = 'inline'; document.getElementById('1601.02070v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1601.02070v1-abstract-full" style="display: none;"> We report a high-resolution spectroscopic investigation of the long-range states of the $^{23}$Na$^{87}$Rb molecule near its Na($3^2S_{1/2}$)+Rb($5^2P_{3/2}$) asymptote. This study was performed with weakly bound ultracold molecules produced via magneto-association with an inter-species Feshbach resonance. We observed several regular vibrational series, which are assigned to the 5 attractive long-range states correlated with this asymptote. The vibrational levels of two of these states have sharp but complex structures due to hyperfine and Zeeman interactions. For the other states, we observed significant linewidth broadenings due to strong predissociation caused by spin-orbit couplings with states correlated to the lower Na($3^2S_{1/2}$)+Rb($5^2P_{1/2}$) asymptote. The long-range $C_6$ van der Waals coefficients extracted from our spectrum are in good agreement with theoretical values. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.02070v1-abstract-full').style.display = 'none'; document.getElementById('1601.02070v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 January, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Phys.Rev. A in press</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 93, 012508 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1601.01119">arXiv:1601.01119</a> <span> [<a href="https://arxiv.org/pdf/1601.01119">pdf</a>, <a href="https://arxiv.org/format/1601.01119">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.117.213002">10.1103/PhysRevLett.117.213002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photodissociation of trapped Rb$^+_2$ : Implications for simultaneous trapping of atoms and molecular ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Jyothi%2C+S">S. Jyothi</a>, <a href="/search/physics?searchtype=author&query=Ray%2C+T">Tridib Ray</a>, <a href="/search/physics?searchtype=author&query=Dutta%2C+S">Sourav Dutta</a>, <a href="/search/physics?searchtype=author&query=Allouche%2C+A+R">A. R. Allouche</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">Romain Vexiau</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Rangwala%2C+S+A">S. A. Rangwala</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1601.01119v2-abstract-short" style="display: inline;"> The direct photodissociation of trapped $^{85}$Rb$_2^+$ (rubidium) molecular ions by the cooling light for the $^{85}$Rb magneto-optical trap (MOT) is studied, both experimentally and theoretically. Vibrationally excited Rb$_{2}^{+}$ ions are created by photoionization of Rb$_{2}$ molecules formed photoassociatively in the Rb MOT and are trapped in a modified spherical Paul trap. The decay rate of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.01119v2-abstract-full').style.display = 'inline'; document.getElementById('1601.01119v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1601.01119v2-abstract-full" style="display: none;"> The direct photodissociation of trapped $^{85}$Rb$_2^+$ (rubidium) molecular ions by the cooling light for the $^{85}$Rb magneto-optical trap (MOT) is studied, both experimentally and theoretically. Vibrationally excited Rb$_{2}^{+}$ ions are created by photoionization of Rb$_{2}$ molecules formed photoassociatively in the Rb MOT and are trapped in a modified spherical Paul trap. The decay rate of the trapped Rb$_{2}^{+}$ ion signal in the presence of the MOT cooling light is measured and agreement with our calculated rates for molecular ion photodissociation is observed. The photodissociation mechanism due to the MOT light is expected to be active and therefore universal for all homonuclear diatomic alkali metal molecular ions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.01119v2-abstract-full').style.display = 'none'; document.getElementById('1601.01119v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 January, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 117, 213002 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1508.06066">arXiv:1508.06066</a> <span> [<a href="https://arxiv.org/pdf/1508.06066">pdf</a>, <a href="https://arxiv.org/ps/1508.06066">ps</a>, <a href="https://arxiv.org/format/1508.06066">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0953-4075/49/1/014004">10.1088/0953-4075/49/1/014004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Four-body long-range interactions between ultracold weakly-bound diatomic molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lepers%2C+M">Maxence Lepers</a>, <a href="/search/physics?searchtype=author&query=Qu%C3%A9m%C3%A9ner%2C+G">Goulven Qu茅m茅ner</a>, <a href="/search/physics?searchtype=author&query=Luc-Koenig%2C+E">Eliane Luc-Koenig</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1508.06066v1-abstract-short" style="display: inline;"> Using the multipolar expansion of electrostatic and magnetostatic potential energies, we characterize the long-range interactions between two weakly-bound diatomic molecules, taking as an example the paramagnetic Er$_2$ Feshbach molecules which were produced recently. Since inside each molecule, individual atoms conserve their identity, the intermolecular potential energy can be expanded as the su… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.06066v1-abstract-full').style.display = 'inline'; document.getElementById('1508.06066v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1508.06066v1-abstract-full" style="display: none;"> Using the multipolar expansion of electrostatic and magnetostatic potential energies, we characterize the long-range interactions between two weakly-bound diatomic molecules, taking as an example the paramagnetic Er$_2$ Feshbach molecules which were produced recently. Since inside each molecule, individual atoms conserve their identity, the intermolecular potential energy can be expanded as the sum of pairwise atomic potential energies. In the case of Er$_2$ Feshbach molecules, we show that the interaction between atomic magnetic dipoles gives rise to the usual $R^{-3}$ term of the multipolar expansion, with $R$ the intermolecular distance, but also to additional terms scaling as $R^{-5}$, $R^{-7}$, and so on. Those terms are due to the interaction between effective molecular multipole moments, and are strongly anisotropic with respect to the orientation of the molecules. Similarly the atomic pairwise van der Waals interaction results in $R^{-6}$, $R^{-8}$, ... terms in the intermolecular potential energy. By calculating the reduced electric-quadrupole moment of erbium ground level $\langle J=6||\hat{Q}_2||J=6\rangle = -1.305$ a.u., we also demonstrate that the electric-quadrupole interaction energy is negligible with respect to the magnetic-dipole and van der Waals interaction energies. The general formalism presented in this article can be applied to calculate the long-range potential energy between arbitrary charge distributions composed of almost free subsystems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.06066v1-abstract-full').style.display = 'none'; document.getElementById('1508.06066v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 August, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted to J. Phys. B, special issue "few-body physics with cold atoms"</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. B, vol. 49, 014004, 2016 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1508.06060">arXiv:1508.06060</a> <span> [<a href="https://arxiv.org/pdf/1508.06060">pdf</a>, <a href="https://arxiv.org/ps/1508.06060">ps</a>, <a href="https://arxiv.org/format/1508.06060">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.93.011401">10.1103/PhysRevA.93.011401 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Proposal for laser-cooling of rare-earth ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lepers%2C+M">Maxence Lepers</a>, <a href="/search/physics?searchtype=author&query=Hong%2C+Y">Ye Hong</a>, <a href="/search/physics?searchtype=author&query=Wyart%2C+J">Jean-Fran莽ois Wyart</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1508.06060v1-abstract-short" style="display: inline;"> The efficiency of laser-cooling relies on the existence of an almost closed optical-transition cycle in the energy spectrum of the considered species. In this respect rare-earth elements exhibit many transitions which are likely to induce noticeable leaks from the cooling cycle. In this work, to determine whether laser-cooling of singly-ionized erbium Er$^+$ is feasible, we have performed accurate… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.06060v1-abstract-full').style.display = 'inline'; document.getElementById('1508.06060v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1508.06060v1-abstract-full" style="display: none;"> The efficiency of laser-cooling relies on the existence of an almost closed optical-transition cycle in the energy spectrum of the considered species. In this respect rare-earth elements exhibit many transitions which are likely to induce noticeable leaks from the cooling cycle. In this work, to determine whether laser-cooling of singly-ionized erbium Er$^+$ is feasible, we have performed accurate electronic-structure calculations of energies and spontaneous-emission Einstein coefficients of Er$^+$, using a combination of \textit{ab initio} and least-square-fitting techniques. We identify five weak closed transitions suitable for laser-cooling, the broadest of which is in the kilohertz range. For the strongest transitions, by simulating the cascade dynamics of spontaneous emission, we show that repumping is necessary, and we discuss possible repumping schemes. We expect our detailed study on Er$^+$ to give a good insight into laser-cooling of neighboring ions like Dy$^+$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.06060v1-abstract-full').style.display = 'none'; document.getElementById('1508.06060v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 August, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 93, 011401 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1508.02289">arXiv:1508.02289</a> <span> [<a href="https://arxiv.org/pdf/1508.02289">pdf</a>, <a href="https://arxiv.org/ps/1508.02289">ps</a>, <a href="https://arxiv.org/format/1508.02289">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.92.042706">10.1103/PhysRevA.92.042706 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dynamics of ultracold dipolar particles in a confined geometry and tilted fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Qu%C3%A9m%C3%A9ner%2C+G">Goulven Qu茅m茅ner</a>, <a href="/search/physics?searchtype=author&query=Lepers%2C+M">Maxence Lepers</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1508.02289v1-abstract-short" style="display: inline;"> We develop a collisional formalism adapted for the dynamics of ultracold dipolar particles in a confined geometry and in fields tilted relative to the confinement axis. Using tesseral harmonics instead of the usual spherical harmonics to expand the scattering wavefunction, we recover a good quantum number $尉= \pm 1$ which is conserved during the collision. We derive the general expression of the d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.02289v1-abstract-full').style.display = 'inline'; document.getElementById('1508.02289v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1508.02289v1-abstract-full" style="display: none;"> We develop a collisional formalism adapted for the dynamics of ultracold dipolar particles in a confined geometry and in fields tilted relative to the confinement axis. Using tesseral harmonics instead of the usual spherical harmonics to expand the scattering wavefunction, we recover a good quantum number $尉= \pm 1$ which is conserved during the collision. We derive the general expression of the dipole-dipole interaction in this convenient basis set as a function of the polar and azimuthal angles of the fields. We apply the formalism to the collision of fermionic and bosonic polar KRb molecules in a tilted electric field and in a one-dimensional optical lattice. The presence of a tilted field drastically changes the magnitude of the reactive and inelastic rates as well as the inelastic threshold properties at vanishing collision energies. Setting an appropriate strength of the confinement for the fermionic system, we show that the ultracold particles can even further reduce their kinetic energy by inelastic excitation to higher states of the confinement trap. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.02289v1-abstract-full').style.display = 'none'; document.getElementById('1508.02289v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 August, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 92, 042706 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1507.06519">arXiv:1507.06519</a> <span> [<a href="https://arxiv.org/pdf/1507.06519">pdf</a>, <a href="https://arxiv.org/format/1507.06519">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.92.032510">10.1103/PhysRevA.92.032510 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Model for the hyperfine structure of electronically-excited ${\rm KCs}$ molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Orb%C3%A1n%2C+A">A. Orb谩n</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">R. Vexiau</a>, <a href="/search/physics?searchtype=author&query=Krieglsteiner%2C+O">O. Krieglsteiner</a>, <a href="/search/physics?searchtype=author&query=N%C3%A4gerl%2C+H+-">H. -C. N盲gerl</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">O. Dulieu</a>, <a href="/search/physics?searchtype=author&query=Crubellier%2C+A">A. Crubellier</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">N. Bouloufa-Maafa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1507.06519v1-abstract-short" style="display: inline;"> A model for determining the hyperfine structure of the excited electronic states of diatomic bialkali heteronuclear molecules is formulated from the atomic hyperfine interactions, and is applied to the case of bosonic $^{39}$KCs and fermionic $^{40}$KCs molecules. The hyperfine structure of the potential energy curves of the states correlated to the K($4s\,^2S_{1/2}$)+Cs($6p\,^2P_{1/2,3/2}$) disso… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.06519v1-abstract-full').style.display = 'inline'; document.getElementById('1507.06519v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1507.06519v1-abstract-full" style="display: none;"> A model for determining the hyperfine structure of the excited electronic states of diatomic bialkali heteronuclear molecules is formulated from the atomic hyperfine interactions, and is applied to the case of bosonic $^{39}$KCs and fermionic $^{40}$KCs molecules. The hyperfine structure of the potential energy curves of the states correlated to the K($4s\,^2S_{1/2}$)+Cs($6p\,^2P_{1/2,3/2}$) dissociation limits is described in terms of different coupling schemes depending on the internuclear distance $R$. These results provide the first step in the calculation of the hyperfine structure of rovibrational levels of these excited molecular states in the perspective of the identification of efficient paths for creating ultracold ground-state KCs molecules. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.06519v1-abstract-full').style.display = 'none'; document.getElementById('1507.06519v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 July, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 15 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 92, 032510 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1505.03288">arXiv:1505.03288</a> <span> [<a href="https://arxiv.org/pdf/1505.03288">pdf</a>, <a href="https://arxiv.org/ps/1505.03288">ps</a>, <a href="https://arxiv.org/format/1505.03288">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.115.073201">10.1103/PhysRevLett.115.073201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Theory of long-range ultracold atom-molecule photoassociation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=P%C3%A9rez-R%C3%ADos%2C+J">Jes煤s P茅rez-R铆os</a>, <a href="/search/physics?searchtype=author&query=Lepers%2C+M">Maxence Lepers</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1505.03288v1-abstract-short" style="display: inline;"> The creation of ultracold molecules is currently limited to diatomic species. In this letter we present a theoretical description of the photoassociation of ultracold atoms and molecules to create ultracold excited triatomic molecules, thus being a novel example of light-assisted ultracold chemical reaction. The calculation of the photoassociation rate of ultracold Cs atoms with ultracold Cs$_2$ m… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1505.03288v1-abstract-full').style.display = 'inline'; document.getElementById('1505.03288v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1505.03288v1-abstract-full" style="display: none;"> The creation of ultracold molecules is currently limited to diatomic species. In this letter we present a theoretical description of the photoassociation of ultracold atoms and molecules to create ultracold excited triatomic molecules, thus being a novel example of light-assisted ultracold chemical reaction. The calculation of the photoassociation rate of ultracold Cs atoms with ultracold Cs$_2$ molecules in their rovibrational ground state is reported, based on the solution of the quantum dynamics involving the atom-molecule long-range interactions, and assuming a model potential for the short-range physics. The rate for the formation of excited Cs$_3$ molecules is predicted to be comparable with currently observed atom-atom photoassociation rates. We formulate an experimental proposal to observe this process relying on the available techniques of optical lattices and standard photoassociation spectroscopy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1505.03288v1-abstract-full').style.display = 'none'; document.getElementById('1505.03288v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 May, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1504.04578">arXiv:1504.04578</a> <span> [<a href="https://arxiv.org/pdf/1504.04578">pdf</a>, <a href="https://arxiv.org/format/1504.04578">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.115.203201">10.1103/PhysRevLett.115.203201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ultracold Dipolar Molecules Composed of Strongly Magnetic Atoms </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Frisch%2C+A">A. Frisch</a>, <a href="/search/physics?searchtype=author&query=Mark%2C+M">M. Mark</a>, <a href="/search/physics?searchtype=author&query=Aikawa%2C+K">K. Aikawa</a>, <a href="/search/physics?searchtype=author&query=Baier%2C+S">S. Baier</a>, <a href="/search/physics?searchtype=author&query=Grimm%2C+R">R. Grimm</a>, <a href="/search/physics?searchtype=author&query=Petrov%2C+A">A. Petrov</a>, <a href="/search/physics?searchtype=author&query=Kotochigova%2C+S">S. Kotochigova</a>, <a href="/search/physics?searchtype=author&query=Qu%C3%A9m%C3%A9ner%2C+G">G. Qu茅m茅ner</a>, <a href="/search/physics?searchtype=author&query=Lepers%2C+M">M. Lepers</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">O. Dulieu</a>, <a href="/search/physics?searchtype=author&query=Ferlaino%2C+F">F. Ferlaino</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1504.04578v2-abstract-short" style="display: inline;"> In a combined experimental and theoretical effort, we demonstrate a novel type of dipolar system made of ultracold bosonic dipolar molecules with large magnetic dipole moments. Our dipolar molecules are formed in weakly bound Feshbach molecular states from a sample of strongly magnetic bosonic erbium atoms. We show that the ultracold magnetic molecules can carry very large dipole moments and we de… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1504.04578v2-abstract-full').style.display = 'inline'; document.getElementById('1504.04578v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1504.04578v2-abstract-full" style="display: none;"> In a combined experimental and theoretical effort, we demonstrate a novel type of dipolar system made of ultracold bosonic dipolar molecules with large magnetic dipole moments. Our dipolar molecules are formed in weakly bound Feshbach molecular states from a sample of strongly magnetic bosonic erbium atoms. We show that the ultracold magnetic molecules can carry very large dipole moments and we demonstrate how to create and characterize them, and how to change their orientation. Finally, we confirm that the relaxation rates of molecules in a quasi-two dimensional geometry can be reduced by using the anisotropy of the dipole-dipole interaction and that this reduction follows a universal dipolar behavior. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1504.04578v2-abstract-full').style.display = 'none'; document.getElementById('1504.04578v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 November, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 April, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 5 figures, including supplemental material</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 115, 203201 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1502.05636">arXiv:1502.05636</a> <span> [<a href="https://arxiv.org/pdf/1502.05636">pdf</a>, <a href="https://arxiv.org/ps/1502.05636">ps</a>, <a href="https://arxiv.org/format/1502.05636">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Long-range interactions between polar bialkali ground-state molecules in arbitrary vibrational levels </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">R. Vexiau</a>, <a href="/search/physics?searchtype=author&query=Lepers%2C+M">M. Lepers</a>, <a href="/search/physics?searchtype=author&query=Aymar%2C+M">M. Aymar</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">N. Bouloufa-Maafa</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">O. Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1502.05636v1-abstract-short" style="display: inline;"> We have calculated the isotropic $C\_6$ coefficients characterizing the long-range van der Waals interaction between two identical heteronuclear alkali-metal diatomic molecules in the same arbitrary vibrational level of their ground electronic state $X^1危^+$. We consider the ten species made up of $^7$Li, $^{23}$Na, $^{39}$K, $^{87}$Rb and $^{133}$Cs. Following our previous work [M.~Lepers \texti… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.05636v1-abstract-full').style.display = 'inline'; document.getElementById('1502.05636v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1502.05636v1-abstract-full" style="display: none;"> We have calculated the isotropic $C\_6$ coefficients characterizing the long-range van der Waals interaction between two identical heteronuclear alkali-metal diatomic molecules in the same arbitrary vibrational level of their ground electronic state $X^1危^+$. We consider the ten species made up of $^7$Li, $^{23}$Na, $^{39}$K, $^{87}$Rb and $^{133}$Cs. Following our previous work [M.~Lepers \textit{et.~al.}, Phys.~Rev.~A \textbf{88}, 032709 (2013)] we use the sum-over-state formula inherent to the second-order perturbation theory, composed of the contributions from the transitions within the ground state levels, from the transition between ground-state and excited state levels, and from a crossed term. These calculations involve a combination of experimental and quantum-chemical data for potential energy curves and transition dipole moments. We also investigate the case where the two molecules are in different vibrational levels and we show that the Moelwyn-Hughes approximation is valid provided that it is applied for each of the three contributions to the sum-over-state formula. Our results are particularly relevant in the context of inelastic and reactive collisions between ultracold bialkali molecules, in deeply bound or in Feshbach levels. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.05636v1-abstract-full').style.display = 'none'; document.getElementById('1502.05636v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 February, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2015. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.06385">arXiv:1501.06385</a> <span> [<a href="https://arxiv.org/pdf/1501.06385">pdf</a>, <a href="https://arxiv.org/format/1501.06385">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/17/4/045015">10.1088/1367-2630/17/4/045015 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Formation of molecular ions by radiative association of cold trapped atoms and ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Silva%2C+H+D">Humberto Da Silva Jr</a>, <a href="/search/physics?searchtype=author&query=Raoult%2C+M">Maurice Raoult</a>, <a href="/search/physics?searchtype=author&query=Aymar%2C+M">Mireille Aymar</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1501.06385v2-abstract-short" style="display: inline;"> Radiative emission during cold collisions between trapped laser-cooled Rb atoms and alkaline-earth ions (Ca$^+$, Sr$^+$, Ba$^+$) and Yb$^+$, and between Li and Yb$^+$, are studied theoretically, using accurate effective-core-potential based quantum chemistry calculations of potential energy curves and transition dipole moments of the related molecular ions. Radiative association of molecular ions… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.06385v2-abstract-full').style.display = 'inline'; document.getElementById('1501.06385v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.06385v2-abstract-full" style="display: none;"> Radiative emission during cold collisions between trapped laser-cooled Rb atoms and alkaline-earth ions (Ca$^+$, Sr$^+$, Ba$^+$) and Yb$^+$, and between Li and Yb$^+$, are studied theoretically, using accurate effective-core-potential based quantum chemistry calculations of potential energy curves and transition dipole moments of the related molecular ions. Radiative association of molecular ions is predicted to occur for all systems with a cross section two to ten times larger than the radiative charge transfer one. Partial and total rate constants are also calculated and compared to available experiments. Narrow shape resonances are expected, which could be detectable at low temperature with an experimental resolution at the limit of the present standards. Vibrational distributions are also calculated, showing that the final molecular ions are not created in their ground state level. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.06385v2-abstract-full').style.display = 'none'; document.getElementById('1501.06385v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 February, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.06276">arXiv:1501.06276</a> <span> [<a href="https://arxiv.org/pdf/1501.06276">pdf</a>, <a href="https://arxiv.org/ps/1501.06276">ps</a>, <a href="https://arxiv.org/format/1501.06276">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Prospects for the formation of ultracold polar ground state KCs molecules via an optical process </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Borsalino%2C+D">D. Borsalino</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">R. Vexiau</a>, <a href="/search/physics?searchtype=author&query=Aymar%2C+M">M. Aymar</a>, <a href="/search/physics?searchtype=author&query=Luc-Koenig%2C+E">E. Luc-Koenig</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">O. Dulieu</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">N. Bouloufa-Maafa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1501.06276v2-abstract-short" style="display: inline;"> Heteronuclear alkali-metal dimers represent the class of molecules of choice for creating samples of ultracold molecules exhibiting an intrinsic large permanent electric dipole moment. Among them, the KCs molecule, with a permanent dipole moment of 1.92~Debye still remains to be observed in ultracold conditions. Based on spectroscopic studies available in the literature completed by accurate quant… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.06276v2-abstract-full').style.display = 'inline'; document.getElementById('1501.06276v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.06276v2-abstract-full" style="display: none;"> Heteronuclear alkali-metal dimers represent the class of molecules of choice for creating samples of ultracold molecules exhibiting an intrinsic large permanent electric dipole moment. Among them, the KCs molecule, with a permanent dipole moment of 1.92~Debye still remains to be observed in ultracold conditions. Based on spectroscopic studies available in the literature completed by accurate quantum chemistry calculations, we propose several optical coherent schemes to create ultracold bosonic and fermionic KCs molecules in their absolute rovibrational ground level, starting from a weakly bound level of their electronic ground state manifold. The processes rely on the existence of convenient electronically excited states allowing an efficient stimulated Raman adiabatic transfer of the level population. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.06276v2-abstract-full').style.display = 'none'; document.getElementById('1501.06276v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 April, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.03793">arXiv:1501.03793</a> <span> [<a href="https://arxiv.org/pdf/1501.03793">pdf</a>, <a href="https://arxiv.org/format/1501.03793">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/17/6/065019">10.1088/1367-2630/17/6/065019 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Polarizability of ultracold $\textrm{Rb}_2$ molecules in the rovibrational ground state of $\mathrm{a}^3危_u^+$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Dei%C3%9F%2C+M">Markus Dei脽</a>, <a href="/search/physics?searchtype=author&query=Drews%2C+B">Bj枚rn Drews</a>, <a href="/search/physics?searchtype=author&query=Denschlag%2C+J+H">Johannes Hecker Denschlag</a>, <a href="/search/physics?searchtype=author&query=Bouloufa-Maafa%2C+N">Nadia Bouloufa-Maafa</a>, <a href="/search/physics?searchtype=author&query=Vexiau%2C+R">Romain Vexiau</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1501.03793v2-abstract-short" style="display: inline;"> We study, both theoretically and experimentally, the dynamical polarizability $伪(蠅)$ of $\textrm{Rb}_2$ molecules in the rovibrational ground state of $\mathrm{a}^3危_u^+$. Taking all relevant excited molecular bound states into account, we compute the complex-valued polarizability $伪(蠅)$ for wave numbers up to $20000\:\textrm{cm}^{-1}$. Our calculations are compared to experimental results at… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.03793v2-abstract-full').style.display = 'inline'; document.getElementById('1501.03793v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.03793v2-abstract-full" style="display: none;"> We study, both theoretically and experimentally, the dynamical polarizability $伪(蠅)$ of $\textrm{Rb}_2$ molecules in the rovibrational ground state of $\mathrm{a}^3危_u^+$. Taking all relevant excited molecular bound states into account, we compute the complex-valued polarizability $伪(蠅)$ for wave numbers up to $20000\:\textrm{cm}^{-1}$. Our calculations are compared to experimental results at $1064.5\:\textrm{nm}$ ($\sim9400\:\textrm{cm}^{-1}$) as well as at $830.4\:\textrm{nm}$ ($\sim12000\:\textrm{cm}^{-1}$). Here, we discuss the measurements at $1064.5\:\textrm{nm}$. The ultracold $\textrm{Rb}_2$ molecules are trapped in the lowest Bloch band of a 3D optical lattice. Their polarizability is determined by lattice modulation spectroscopy which measures the potential depth for a given light intensity. Moreover, we investigate the decay of molecules in the optical lattice, where lifetimes of more than $2\:\textrm{s}$ are observed. In addition, the dynamical polarizability for the $\mathrm{X}^1危_g^+$ state is calculated. We provide simple analytical expressions that reproduce the numerical results for $伪(蠅)$ for all vibrational levels of $\mathrm{a}^3危_u^+$ as well as $\mathrm{X}^1危_g^+$. Precise knowledge of the molecular polarizability is essential for designing experiments with ultracold molecules as lifetimes and lattice depths are key parameters. Specifically the wavelength at $\sim1064\:\textrm{nm}$ is of interest, since here, ultrastable high power lasers are available. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.03793v2-abstract-full').style.display = 'none'; document.getElementById('1501.03793v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 December, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> New J. Phys. 17, 065019 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.03778">arXiv:1501.03778</a> <span> [<a href="https://arxiv.org/pdf/1501.03778">pdf</a>, <a href="https://arxiv.org/ps/1501.03778">ps</a>, <a href="https://arxiv.org/format/1501.03778">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> </div> <p class="title is-5 mathjax"> Theoretical study of radiative electron attachment to CN, C2H, and C4H radicals </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Douguet%2C+N">Nicolas Douguet</a>, <a href="/search/physics?searchtype=author&query=Santos%2C+S+F+d">Samantha Fonseca dos Santos</a>, <a href="/search/physics?searchtype=author&query=Raoult%2C+M">Maurice Raoult</a>, <a href="/search/physics?searchtype=author&query=Dulieu%2C+O">Olivier Dulieu</a>, <a href="/search/physics?searchtype=author&query=Orel%2C+A+E">Ann E. Orel</a>, <a href="/search/physics?searchtype=author&query=Kokoouline%2C+V">Viatcheslav Kokoouline</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1501.03778v1-abstract-short" style="display: inline;"> A first-principle theoretical approach to study the process of radiative electron attachment is developed and applied to the negative molecular ions CN$^-$, C$_4$H$^-$, and C$_2$H$^-$. Among these anions, the first two have already been observed in the interstellar space. Cross sections and rate coefficients for formation of these ions by radiative electron attachment to the corresponding neutral… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.03778v1-abstract-full').style.display = 'inline'; document.getElementById('1501.03778v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.03778v1-abstract-full" style="display: none;"> A first-principle theoretical approach to study the process of radiative electron attachment is developed and applied to the negative molecular ions CN$^-$, C$_4$H$^-$, and C$_2$H$^-$. Among these anions, the first two have already been observed in the interstellar space. Cross sections and rate coefficients for formation of these ions by radiative electron attachment to the corresponding neutral radicals are calculated. For completeness of the theoretical approach, two pathways for the process have been considered: (i) A direct pathway, in which the electron in collision with the molecule spontaneously emits a photon and forms a negative ion in one of the lowest vibrational levels, and (ii) an indirect, or two-step pathway, in which the electron is initially captured through non-Born-Oppenheimer coupling into a vibrationally resonant excited state of the anion, which then stabilizes by radiative decay. We develop a general model to describe the second pathway and show that its contribution to the formation of cosmic anions is small in comparison to the direct mechanism. The obtained rate coefficients at 30~K are $7\times 10^{-16}$cm$^3$/s for CN$^-$, $7\times 10^{-17}$cm$^3$/s for C$_2$H$^-$, and $2\times 10^{-16}$cm$^3$/s for C$_4$H$^-$. These rates weakly depend on temperature between 10K and 100 K. The validity of our calculations is verified by comparing the present theoretical results with data from recent photodetachment experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.03778v1-abstract-full').style.display = 'none'; document.getElementById('1501.03778v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Dulieu%2C+O&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Dulieu%2C+O&start=0" 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