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class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.11920">arXiv:2305.11920</a> <span> [<a href="https://arxiv.org/pdf/2305.11920">pdf</a>, <a href="https://arxiv.org/format/2305.11920">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Image and Video Processing">eess.IV</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Megahertz X-ray Multi-projection imaging </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Villanueva-Perez%2C+P">Pablo Villanueva-Perez</a>, <a href="/search/?searchtype=author&query=Bellucci%2C+V">Valerio Bellucci</a>, <a href="/search/?searchtype=author&query=Zhang%2C+Y">Yuhe Zhang</a>, <a href="/search/?searchtype=author&query=Birnsteinova%2C+S">Sarlota Birnsteinova</a>, <a href="/search/?searchtype=author&query=Graceffa%2C+R">Rita Graceffa</a>, <a href="/search/?searchtype=author&query=Adriano%2C+L">Luigi Adriano</a>, <a href="/search/?searchtype=author&query=Asimakopoulou%2C+E+M">Eleni Myrto Asimakopoulou</a>, <a href="/search/?searchtype=author&query=Petrov%2C+I">Ilia Petrov</a>, <a href="/search/?searchtype=author&query=Yao%2C+Z">Zisheng Yao</a>, <a href="/search/?searchtype=author&query=Romagnoni%2C+M">Marco Romagnoni</a>, <a href="/search/?searchtype=author&query=Mazzolari%2C+A">Andrea Mazzolari</a>, <a href="/search/?searchtype=author&query=Letrun%2C+R">Romain Letrun</a>, <a href="/search/?searchtype=author&query=Kim%2C+C">Chan Kim</a>, <a href="/search/?searchtype=author&query=Koliyadu%2C+J+C+P">Jayanath C. P. Koliyadu</a>, <a href="/search/?searchtype=author&query=Deiter%2C+C">Carsten Deiter</a>, <a href="/search/?searchtype=author&query=Bean%2C+R">Richard Bean</a>, <a href="/search/?searchtype=author&query=Giovanetti%2C+G">Gabriele Giovanetti</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Ritschel%2C+T">Tobias Ritschel</a>, <a href="/search/?searchtype=author&query=Mancuso%2C+A">Adrian Mancuso</a>, <a href="/search/?searchtype=author&query=Chapman%2C+H+N">Henry N. Chapman</a>, <a href="/search/?searchtype=author&query=Meents%2C+A">Alke Meents</a>, <a href="/search/?searchtype=author&query=Sato%2C+T">Tokushi Sato</a>, <a href="/search/?searchtype=author&query=Vagovic%2C+P">Patrik Vagovic</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="2305.11920v1-abstract-short" style="display: inline;"> X-ray time-resolved tomography is one of the most popular X-ray techniques to probe dynamics in three dimensions (3D). Recent developments in time-resolved tomography opened the possibility of recording kilohertz-rate 3D movies. However, tomography requires rotating the sample with respect to the X-ray beam, which prevents characterization of faster structural dynamics. Here, we present megahertz… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.11920v1-abstract-full').style.display = 'inline'; document.getElementById('2305.11920v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.11920v1-abstract-full" style="display: none;"> X-ray time-resolved tomography is one of the most popular X-ray techniques to probe dynamics in three dimensions (3D). Recent developments in time-resolved tomography opened the possibility of recording kilohertz-rate 3D movies. However, tomography requires rotating the sample with respect to the X-ray beam, which prevents characterization of faster structural dynamics. Here, we present megahertz (MHz) X-ray multi-projection imaging (MHz-XMPI), a technique capable of recording volumetric information at MHz rates and micrometer resolution without scanning the sample. We achieved this by harnessing the unique megahertz pulse structure and intensity of the European X-ray Free-electron Laser with a combination of novel detection and reconstruction approaches that do not require sample rotations. Our approach enables generating multiple X-ray probes that simultaneously record several angular projections for each pulse in the megahertz pulse burst. We provide a proof-of-concept demonstration of the MHz-XMPI technique's capability to probe 4D (3D+time) information on stochastic phenomena and non-reproducible processes three orders of magnitude faster than state-of-the-art time-resolved X-ray tomography, by generating 3D movies of binary droplet collisions. We anticipate that MHz-XMPI will enable in-situ and operando studies that were impossible before, either due to the lack of temporal resolution or because the systems were opaque (such as for MHz imaging based on optical microscopy). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.11920v1-abstract-full').style.display = 'none'; document.getElementById('2305.11920v1-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, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.12362">arXiv:2302.12362</a> <span> [<a href="https://arxiv.org/pdf/2302.12362">pdf</a>, <a href="https://arxiv.org/format/2302.12362">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Infrared-induced ultrafast melting of nanostructured platinum films probed by an X-ray free-electron laser </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Kim%2C+Y+Y">Young Yong Kim</a>, <a href="/search/?searchtype=author&query=Lim%2C+S+W">Seon Woo Lim</a>, <a href="/search/?searchtype=author&query=Nam%2C+D">Daewoong Nam</a>, <a href="/search/?searchtype=author&query=Eom%2C+I">Intae Eom</a>, <a href="/search/?searchtype=author&query=Kim%2C+M">Minseok Kim</a>, <a href="/search/?searchtype=author&query=Kim%2C+S">Sangsoo Kim</a>, <a href="/search/?searchtype=author&query=Khubbutdinov%2C+R">Ruslan Khubbutdinov</a>, <a href="/search/?searchtype=author&query=Xiang%2C+L">Li Xiang</a>, <a href="/search/?searchtype=author&query=Lee%2C+H">Hoyeol Lee</a>, <a href="/search/?searchtype=author&query=Ree%2C+M">Moonhor Ree</a>, <a href="/search/?searchtype=author&query=Kim%2C+C+U">Chae Un Kim</a>, <a href="/search/?searchtype=author&query=Vartanyants%2C+I+A">Ivan A. Vartanyants</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="2302.12362v1-abstract-short" style="display: inline;"> Understanding melting in metals is a hot topic of present research. This may be accomplished by pumping the system with infrared (IR) laser radiation, and probing it with hard X-rays produced by an X-ray Free-Electron Laser (XFEL). In this work we studied nanostructured polycrystalline thin films of platinum that were illuminated by IR radiation of increasing fluences. We characterized the structu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.12362v1-abstract-full').style.display = 'inline'; document.getElementById('2302.12362v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.12362v1-abstract-full" style="display: none;"> Understanding melting in metals is a hot topic of present research. This may be accomplished by pumping the system with infrared (IR) laser radiation, and probing it with hard X-rays produced by an X-ray Free-Electron Laser (XFEL). In this work we studied nanostructured polycrystalline thin films of platinum that were illuminated by IR radiation of increasing fluences. We characterized the structural response as well as the nucleation and propagation of the liquid phase as a function of time delay between the IR pump and X-ray probe. We observed partial melting of the samples for IR fluences higher than 200 mJ$\cdot$cm$^{-2}$. To fit the contribution of the liquid phase to the scattering pattern in platinum we applied a model of liquid metal. The two-temperature model simulations were performed to understand the solid-state fraction of the sample heating process as a function of time delay and fluence. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.12362v1-abstract-full').style.display = 'none'; document.getElementById('2302.12362v1-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 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.04265">arXiv:2211.04265</a> <span> [<a href="https://arxiv.org/pdf/2211.04265">pdf</a>, <a href="https://arxiv.org/format/2211.04265">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 Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</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/10.1107/S1600577523000619">10.1107/S1600577523000619 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photon shot-noise limited transient absorption soft X-ray spectroscopy at the European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Eschenlohr%2C+A">Andrea Eschenlohr</a>, <a href="/search/?searchtype=author&query=Beye%2C+M">Martin Beye</a>, <a href="/search/?searchtype=author&query=Schlotter%2C+W">William Schlotter</a>, <a href="/search/?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/?searchtype=author&query=Carinan%2C+C">Cammille Carinan</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/?searchtype=author&query=Bovensiepen%2C+U">Uwe Bovensiepen</a>, <a href="/search/?searchtype=author&query=Buck%2C+J">Jens Buck</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Castoldi%2C+A">Andrea Castoldi</a>, <a href="/search/?searchtype=author&query=D%27Elia%2C+A">Alessandro D'Elia</a>, <a href="/search/?searchtype=author&query=Delitz%2C+J">Jan-Torben Delitz</a>, <a href="/search/?searchtype=author&query=Ehsan%2C+W">Wajid Ehsan</a>, <a href="/search/?searchtype=author&query=Engel%2C+R">Robin Engel</a>, <a href="/search/?searchtype=author&query=Erdinger%2C+F">Florian Erdinger</a>, <a href="/search/?searchtype=author&query=Fangohr%2C+H">Hans Fangohr</a>, <a href="/search/?searchtype=author&query=Fischer%2C+P">Peter Fischer</a>, <a href="/search/?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/?searchtype=author&query=F%C3%B6hlisch%2C+A">Alexander F枚hlisch</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Gensch%2C+M">Michael Gensch</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a> , et al. (39 additional authors not shown) </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="2211.04265v3-abstract-short" style="display: inline;"> Femtosecond transient soft X-ray Absorption Spectroscopy (XAS) is a very promising technique that can be employed at X-ray Free Electron Lasers (FELs) to investigate out-of-equilibrium dynamics for material and energy research. Here we present a dedicated setup for soft X-rays available at the Spectroscopy & Coherent Scattering (SCS) instrument at the European X-ray Free Electron Laser (EuXFEL). I… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.04265v3-abstract-full').style.display = 'inline'; document.getElementById('2211.04265v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.04265v3-abstract-full" style="display: none;"> Femtosecond transient soft X-ray Absorption Spectroscopy (XAS) is a very promising technique that can be employed at X-ray Free Electron Lasers (FELs) to investigate out-of-equilibrium dynamics for material and energy research. Here we present a dedicated setup for soft X-rays available at the Spectroscopy & Coherent Scattering (SCS) instrument at the European X-ray Free Electron Laser (EuXFEL). It consists of a beam-splitting off-axis zone plate (BOZ) used in transmission to create three copies of the incoming beam, which are used to measure the transmitted intensity through the excited and unexcited sample, as well as to monitor the incoming intensity. Since these three intensity signals are detected shot-by-shot and simultaneously, this setup allows normalized shot-by-shot analysis of the transmission. For photon detection, the DSSC imaging detector, which is capable of recording up to 800 images at 4.5 MHz frame rate during the FEL burst, is employed and allows approaching the photon shot-noise limit. We review the setup and its capabilities, as well as the online and offline analysis tools provided to users. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.04265v3-abstract-full').style.display = 'none'; document.getElementById('2211.04265v3-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> 4 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">11 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Synchrotron Rad. (2023). 30, 284-300 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.11712">arXiv:2203.11712</a> <span> [<a href="https://arxiv.org/pdf/2203.11712">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> On the use of multilayer Laue lenses with X-ray Free Electron Lasers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Prasciolu%2C+M">Mauro Prasciolu</a>, <a href="/search/?searchtype=author&query=Murray%2C+K+T">Kevin T. Murray</a>, <a href="/search/?searchtype=author&query=Ivanov%2C+N">Nikolay Ivanov</a>, <a href="/search/?searchtype=author&query=Fleckenstein%2C+H">Holger Fleckenstein</a>, <a href="/search/?searchtype=author&query=Domarack%C3%BD%2C+M">Martin Domarack媒</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Trost%2C+F">Fabian Trost</a>, <a href="/search/?searchtype=author&query=Ayyer%2C+K">Kartik Ayyer</a>, <a href="/search/?searchtype=author&query=Krebs%2C+D">Dietrich Krebs</a>, <a href="/search/?searchtype=author&query=Aplin%2C+S">Steve Aplin</a>, <a href="/search/?searchtype=author&query=Awel%2C+S">Salah Awel</a>, <a href="/search/?searchtype=author&query=Boesenberg%2C+U">Ulrike Boesenberg</a>, <a href="/search/?searchtype=author&query=Barty%2C+A">Anton Barty</a>, <a href="/search/?searchtype=author&query=Estillore%2C+A+D">Armando D. Estillore</a>, <a href="/search/?searchtype=author&query=Fuchs%2C+M">Matthias Fuchs</a>, <a href="/search/?searchtype=author&query=Gevorkov%2C+Y">Yaroslav Gevorkov</a>, <a href="/search/?searchtype=author&query=Hallmann%2C+J">Joerg Hallmann</a>, <a href="/search/?searchtype=author&query=Kim%2C+C">Chan Kim</a>, <a href="/search/?searchtype=author&query=Kno%C5%A1ka%2C+J">Juraj Kno拧ka</a>, <a href="/search/?searchtype=author&query=K%C3%BCpper%2C+J">Jochen K眉pper</a>, <a href="/search/?searchtype=author&query=Li%2C+C">Chufeng Li</a>, <a href="/search/?searchtype=author&query=Lu%2C+W">Wei Lu</a>, <a href="/search/?searchtype=author&query=Mariani%2C+V">Valerio Mariani</a>, <a href="/search/?searchtype=author&query=Morgan%2C+A+J">Andrew J. Morgan</a>, <a href="/search/?searchtype=author&query=M%C3%B6ller%2C+J">Johannes M枚ller</a> , et al. (12 additional authors not shown) </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="2203.11712v1-abstract-short" style="display: inline;"> Multilayer Laue lenses were used for the first time to focus x-rays from an X-ray Free Electron Laser (XFEL). In an experiment, which was performed at the European XFEL, we demonstrated focusing to a spot size of a few tens of nanometers. A series of runs in which the number of pulses per train was increased from 1 to 2, 3, 4, 5, 6, 7, 10, 20 and 30 pulses per train, all with a pulse separation of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.11712v1-abstract-full').style.display = 'inline'; document.getElementById('2203.11712v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.11712v1-abstract-full" style="display: none;"> Multilayer Laue lenses were used for the first time to focus x-rays from an X-ray Free Electron Laser (XFEL). In an experiment, which was performed at the European XFEL, we demonstrated focusing to a spot size of a few tens of nanometers. A series of runs in which the number of pulses per train was increased from 1 to 2, 3, 4, 5, 6, 7, 10, 20 and 30 pulses per train, all with a pulse separation of 3.55 us, was done using the same set of lenses. The increase in the number of pulses per train was accompanied with an increase of x-ray intensity (transmission) from 9% to 92% at 5 pulses per train, and then the transmission was reduced to 23.5 % when the pulses were increased further. The final working condition was 30 pulses per train and 23.5% transmission. Only at this condition we saw that the diffraction efficiency of the MLLs changed over the course of a pulse train, and this variation was reproducible from train to train. We present the procedure to align and characterize these lenses and discuss challenges working with the pulse trains from this unique x-ray source. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.11712v1-abstract-full').style.display = 'none'; document.getElementById('2203.11712v1-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> 22 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2108.10173">arXiv:2108.10173</a> <span> [<a href="https://arxiv.org/pdf/2108.10173">pdf</a>, <a href="https://arxiv.org/format/2108.10173">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Influence of Contacts and Applied Voltage on a Structure of a Single GaN Nanowire </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Lazarev%2C+S">Sergey Lazarev</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Kim%2C+Y+Y">Young Yong Kim</a>, <a href="/search/?searchtype=author&query=Zhaoxia%2C+B">Bi Zhaoxia</a>, <a href="/search/?searchtype=author&query=Nowzari%2C+A">Ali Nowzari</a>, <a href="/search/?searchtype=author&query=Zaluzhnyy%2C+I+A">Ivan A. Zaluzhnyy</a>, <a href="/search/?searchtype=author&query=Khubbutdinov%2C+R">Ruslan Khubbutdinov</a>, <a href="/search/?searchtype=author&query=Dzhigaev%2C+D">Dmitry Dzhigaev</a>, <a href="/search/?searchtype=author&query=Jeromin%2C+A">Arno Jeromin</a>, <a href="/search/?searchtype=author&query=Keller%2C+T">Thomas Keller</a>, <a href="/search/?searchtype=author&query=Sprung%2C+M">Michael Sprung</a>, <a href="/search/?searchtype=author&query=Mikkelsen%2C+A">Anders Mikkelsen</a>, <a href="/search/?searchtype=author&query=Samuelson%2C+L">Lars Samuelson</a>, <a href="/search/?searchtype=author&query=Vartanyants%2C+I+A">Ivan A. Vartanyants</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="2108.10173v1-abstract-short" style="display: inline;"> Semiconductor nanowires (NWs) have a broad range of applications for nano- and optoelectronics. The strain field of gallium nitride (GaN) NWs could be significantly changed when contacts are applied to them to form a final device, especially considering the piezoelectric properties of GaN. Investigation of influence of the metallic contacts on the structure of the NWs is of high importance for the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.10173v1-abstract-full').style.display = 'inline'; document.getElementById('2108.10173v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.10173v1-abstract-full" style="display: none;"> Semiconductor nanowires (NWs) have a broad range of applications for nano- and optoelectronics. The strain field of gallium nitride (GaN) NWs could be significantly changed when contacts are applied to them to form a final device, especially considering the piezoelectric properties of GaN. Investigation of influence of the metallic contacts on the structure of the NWs is of high importance for their applications in real devices. We have studied a series of different type of contacts and influence of the applied voltage bias on the contacted GaN NWs with the length of about 3 to 4 micrometers and with two different diameters of 200 nm and 350 nm. It was demonstrated that the NWs with the diameter of 200 nm are bend already by the interaction with the substrate. For all GaN NWs, significant structural changes were revealed after the contacts deposition. The results of our research may contribute to the future optoelectronic applications of the GaN nanowires. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.10173v1-abstract-full').style.display = 'none'; document.getElementById('2108.10173v1-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, 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">18 pages, 7 figures, 14 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/2104.11136">arXiv:2104.11136</a> <span> [<a href="https://arxiv.org/pdf/2104.11136">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> High spatial coherence and short pulse duration revealed by the Hanbury Brown and Twiss interferometry at the European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Khubbutdinov%2C+R">Ruslan Khubbutdinov</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Assalauova%2C+D">Dameli Assalauova</a>, <a href="/search/?searchtype=author&query=Carnis%2C+J">Jerome Carnis</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+l">Lo茂c le Guyader</a>, <a href="/search/?searchtype=author&query=Ignatenko%2C+A">Alexandr Ignatenko</a>, <a href="/search/?searchtype=author&query=Kim%2C+Y+Y">Young Yong Kim</a>, <a href="/search/?searchtype=author&query=van+Kuiken%2C+B">Benjamin van Kuiken</a>, <a href="/search/?searchtype=author&query=Kurta%2C+R+P">Ruslan P. Kurta</a>, <a href="/search/?searchtype=author&query=Lapkin%2C+D">Dmitry Lapkin</a>, <a href="/search/?searchtype=author&query=Teichmann%2C+M">Martin Teichmann</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">Alexander Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Gorobtsov%2C+O">Oleg Gorobtsov</a>, <a href="/search/?searchtype=author&query=Menushenkov%2C+A+P">Aleksey P. Menushenkov</a>, <a href="/search/?searchtype=author&query=Scholz%2C+M">Matthias Scholz</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">Andreas Scherz</a>, <a href="/search/?searchtype=author&query=Vartanyants%2C+I+A">Ivan A. Vartanyants</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="2104.11136v1-abstract-short" style="display: inline;"> Second-order intensity interferometry was employed to study the spatial and temporal properties of the European X-ray Free-Electron Laser (EuXFEL). Measurements were performed at the soft X-ray SASE3 undulator beamline at a photon energy of 1.2 keV in the Self-Amplified Spontaneous Emission (SASE) mode. Two high-power regimes of the SASE3 undulator settings, i.e. linear and quadratic tapering at s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.11136v1-abstract-full').style.display = 'inline'; document.getElementById('2104.11136v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.11136v1-abstract-full" style="display: none;"> Second-order intensity interferometry was employed to study the spatial and temporal properties of the European X-ray Free-Electron Laser (EuXFEL). Measurements were performed at the soft X-ray SASE3 undulator beamline at a photon energy of 1.2 keV in the Self-Amplified Spontaneous Emission (SASE) mode. Two high-power regimes of the SASE3 undulator settings, i.e. linear and quadratic tapering at saturation, were studied in detail and compared with the linear gain regime. The statistical analysis showed an exceptionally high degree of spatial coherence up to 90% for the linear undulator tapering. Analysis of the measured data in spectral and spatial domains provided an average pulse duration of about 10 fs in our measurements. The obtained results will be valuable for the experiments requiring and exploiting short pulse duration and utilizing high coherence properties of the EuXFEL. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.11136v1-abstract-full').style.display = 'none'; document.getElementById('2104.11136v1-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> 22 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">12 pages, 6 figures, 2 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/2103.01573">arXiv:2103.01573</a> <span> [<a href="https://arxiv.org/pdf/2103.01573">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</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/sciadv.abh0757">10.1126/sciadv.abh0757 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Single Alloy Nanoparticle X-Ray Imaging during a Catalytic Reaction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Kim%2C+Y+Y">Young Yong Kim</a>, <a href="/search/?searchtype=author&query=Keller%2C+T+F">Thomas F. Keller</a>, <a href="/search/?searchtype=author&query=Goncalves%2C+T+J">Tiago J. Goncalves</a>, <a href="/search/?searchtype=author&query=Abuin%2C+M">Manuel Abuin</a>, <a href="/search/?searchtype=author&query=Runge%2C+H">Henning Runge</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Carnis%2C+J">Jerome Carnis</a>, <a href="/search/?searchtype=author&query=Vonk%2C+V">Vedran Vonk</a>, <a href="/search/?searchtype=author&query=Plessow%2C+P+N">Philipp N. Plessow</a>, <a href="/search/?searchtype=author&query=Vartanyants%2C+I+A">Ivan A. Vartanyants</a>, <a href="/search/?searchtype=author&query=Stierle%2C+A">Andreas Stierle</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="2103.01573v1-abstract-short" style="display: inline;"> The imaging of active nanoparticles represents a milestone in decoding heterogeneous catalysts dynamics. We report the facet resolved, surface strain state of a single PtRh alloy nanoparticle on SrTiO3 determined by coherent x-ray diffraction imaging under catalytic reaction conditions. Density functional theory calculations allow us to correlate the facet surface strain state to its reaction envi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.01573v1-abstract-full').style.display = 'inline'; document.getElementById('2103.01573v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.01573v1-abstract-full" style="display: none;"> The imaging of active nanoparticles represents a milestone in decoding heterogeneous catalysts dynamics. We report the facet resolved, surface strain state of a single PtRh alloy nanoparticle on SrTiO3 determined by coherent x-ray diffraction imaging under catalytic reaction conditions. Density functional theory calculations allow us to correlate the facet surface strain state to its reaction environment dependent chemical composition. We find that the initially Pt terminated nanoparticle surface gets Rh enriched under CO oxidation reaction conditions. The local composition is facet orientation dependent and the Rh enrichment is non-reversible under subsequent CO reduction. Tracking facet resolved strain and composition under operando conditions is crucial for a rational design of more efficient heterogeneous catalysts with tailored activity, selectivity and lifetime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.01573v1-abstract-full').style.display = 'none'; document.getElementById('2103.01573v1-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 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">15 pages, 4 figures, 32 references</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science Advances 7, eabh0757 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2008.07288">arXiv:2008.07288</a> <span> [<a href="https://arxiv.org/pdf/2008.07288">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Image and Video Processing">eess.IV</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</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/10.1088/2632-2153/abd916">10.1088/2632-2153/abd916 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Classification of diffraction patterns in single particle imaging experiments performed at X-ray free-electron lasers using a convolutional neural network </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Ignatenko%2C+A">Alexandr Ignatenko</a>, <a href="/search/?searchtype=author&query=Assalauova%2C+D">Dameli Assalauova</a>, <a href="/search/?searchtype=author&query=Bobkov%2C+S+A">Sergey A. Bobkov</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Teslyuk%2C+A+B">Anton B. Teslyuk</a>, <a href="/search/?searchtype=author&query=Ilyin%2C+V+A">Viacheslav A. Ilyin</a>, <a href="/search/?searchtype=author&query=Vartanyants%2C+I+A">Ivan A. Vartanyants</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="2008.07288v1-abstract-short" style="display: inline;"> Single particle imaging (SPI) is a promising method for native structure determination which has undergone a fast progress with the development of X-ray Free-Electron Lasers. Large amounts of data are collected during SPI experiments, driving the need for automated data analysis. The necessary data analysis pipeline has a number of steps including binary object classification (single versus multip… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.07288v1-abstract-full').style.display = 'inline'; document.getElementById('2008.07288v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2008.07288v1-abstract-full" style="display: none;"> Single particle imaging (SPI) is a promising method for native structure determination which has undergone a fast progress with the development of X-ray Free-Electron Lasers. Large amounts of data are collected during SPI experiments, driving the need for automated data analysis. The necessary data analysis pipeline has a number of steps including binary object classification (single versus multiple hits). Classification and object detection are areas where deep neural networks currently outperform other approaches. In this work, we use the fast object detector networks YOLOv2 and YOLOv3. By exploiting transfer learning, a moderate amount of data is sufficient for training of the neural network. We demonstrate here that a convolutional neural network (CNN) can be successfully used to classify data from SPI experiments. We compare the results of classification for the two different networks, with different depth and architecture, by applying them to the same SPI data with different data representation. The best results are obtained for YOLOv2 color images linear scale classification, which shows an accuracy of about 97% with the precision and recall of about 52% and 61%, respectively, which is in comparison to manual data classification. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.07288v1-abstract-full').style.display = 'none'; document.getElementById('2008.07288v1-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 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">23 pages, 6 figures, 3 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Mach. Learn.: Sci. Technol. 2 (2021) 025014 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.08345">arXiv:2006.08345</a> <span> [<a href="https://arxiv.org/pdf/2006.08345">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Biological Physics">physics.bio-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> </div> </div> <p class="title is-5 mathjax"> An advanced workflow for single particle imaging with the limited data at an X-ray free-electron laser </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Assalauova%2C+D">Dameli Assalauova</a>, <a href="/search/?searchtype=author&query=Kim%2C+Y+Y">Young Yong Kim</a>, <a href="/search/?searchtype=author&query=Bobkov%2C+S">Sergey Bobkov</a>, <a href="/search/?searchtype=author&query=Khubbutdinov%2C+R">Ruslan Khubbutdinov</a>, <a href="/search/?searchtype=author&query=Rose%2C+M">Max Rose</a>, <a href="/search/?searchtype=author&query=Alvarez%2C+R">Roberto Alvarez</a>, <a href="/search/?searchtype=author&query=Andreasson%2C+J">Jakob Andreasson</a>, <a href="/search/?searchtype=author&query=Balaur%2C+E">Eugeniu Balaur</a>, <a href="/search/?searchtype=author&query=Contreras%2C+A">Alice Contreras</a>, <a href="/search/?searchtype=author&query=DeMirci%2C+H">Hasan DeMirci</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Hajdu%2C+J">Janos Hajdu</a>, <a href="/search/?searchtype=author&query=Hunter%2C+M+S">Mark S. Hunter</a>, <a href="/search/?searchtype=author&query=Kurta%2C+R+P">Ruslan P. Kurta</a>, <a href="/search/?searchtype=author&query=Li%2C+H">Haoyuan Li</a>, <a href="/search/?searchtype=author&query=McFadden%2C+M">Matthew McFadden</a>, <a href="/search/?searchtype=author&query=Nazari%2C+R">Reza Nazari</a>, <a href="/search/?searchtype=author&query=Schwander%2C+P">Peter Schwander</a>, <a href="/search/?searchtype=author&query=Teslyuk%2C+A">Anton Teslyuk</a>, <a href="/search/?searchtype=author&query=Walter%2C+P">Peter Walter</a>, <a href="/search/?searchtype=author&query=Xavier%2C+P+L">P. Lourdu Xavier</a>, <a href="/search/?searchtype=author&query=Yoon%2C+C+H">Chun Hong Yoon</a>, <a href="/search/?searchtype=author&query=Zaared%2C+S">Sahba Zaared</a>, <a href="/search/?searchtype=author&query=Ilyin%2C+V+A">Viacheslav A. Ilyin</a>, <a href="/search/?searchtype=author&query=Kirian%2C+R+A">Richard A. Kirian</a> , et al. (3 additional authors not shown) </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="2006.08345v1-abstract-short" style="display: inline;"> An improved analysis for single particle imaging (SPI) experiments, using the limited data, is presented here. Results are based on a study of bacteriophage PR772 performed at the AMO instrument at the Linac Coherent Light Source (LCLS) as part of the SPI initiative. Existing methods were modified to cope with the shortcomings of the experimental data: inaccessibility of information from the half… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.08345v1-abstract-full').style.display = 'inline'; document.getElementById('2006.08345v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.08345v1-abstract-full" style="display: none;"> An improved analysis for single particle imaging (SPI) experiments, using the limited data, is presented here. Results are based on a study of bacteriophage PR772 performed at the AMO instrument at the Linac Coherent Light Source (LCLS) as part of the SPI initiative. Existing methods were modified to cope with the shortcomings of the experimental data: inaccessibility of information from the half of the detector and small fraction of single hits. General SPI analysis workflow was upgraded with the expectation-maximization based classification of diffraction patterns and mode decomposition on the final virus structure determination step. The presented processing pipeline allowed us to determine the three-dimensional structure of the bacteriophage PR772 without symmetry constraints with a spatial resolution of 6.9 nm. The obtained resolution was limited by the scattering intensity during the experiment and the relatively small number of single hits. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.08345v1-abstract-full').style.display = 'none'; document.getElementById('2006.08345v1-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 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">Comments:</span> <span class="has-text-grey-dark mathjax">40 pages, 7 figures (main text), 2 tables (main text), 14 figures (supplementary information), 1 table (supplementary information)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1912.10796">arXiv:1912.10796</a> <span> [<a href="https://arxiv.org/pdf/1912.10796">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Biological Physics">physics.bio-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/s42005-020-0362-y">10.1038/s42005-020-0362-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Megahertz single-particle imaging at the European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Sobolev%2C+E">Egor Sobolev</a>, <a href="/search/?searchtype=author&query=Zolotarev%2C+S">Serguey Zolotarev</a>, <a href="/search/?searchtype=author&query=Giewekemeyer%2C+K">Klaus Giewekemeyer</a>, <a href="/search/?searchtype=author&query=Bielecki%2C+J">Johan Bielecki</a>, <a href="/search/?searchtype=author&query=Okamoto%2C+K">Kenta Okamoto</a>, <a href="/search/?searchtype=author&query=Reddy%2C+H+K+N">Hemanth K. N. Reddy</a>, <a href="/search/?searchtype=author&query=Andreasson%2C+J">Jakob Andreasson</a>, <a href="/search/?searchtype=author&query=Ayyer%2C+K">Kartik Ayyer</a>, <a href="/search/?searchtype=author&query=Barak%2C+I">Imrich Barak</a>, <a href="/search/?searchtype=author&query=Bari%2C+S">Sadia Bari</a>, <a href="/search/?searchtype=author&query=Barty%2C+A">Anton Barty</a>, <a href="/search/?searchtype=author&query=Bean%2C+R">Richard Bean</a>, <a href="/search/?searchtype=author&query=Bobkov%2C+S">Sergey Bobkov</a>, <a href="/search/?searchtype=author&query=Chapman%2C+H+N">Henry N. Chapman</a>, <a href="/search/?searchtype=author&query=Chojnowski%2C+G">Grzegorz Chojnowski</a>, <a href="/search/?searchtype=author&query=Daurer%2C+B+J">Benedikt J. Daurer</a>, <a href="/search/?searchtype=author&query=D%C3%B6rner%2C+K">Katerina D枚rner</a>, <a href="/search/?searchtype=author&query=Ekeberg%2C+T">Tomas Ekeberg</a>, <a href="/search/?searchtype=author&query=Fl%C3%BCckiger%2C+L">Leonie Fl眉ckiger</a>, <a href="/search/?searchtype=author&query=Galzitskaya%2C+O">Oxana Galzitskaya</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Hauf%2C+S">Steffen Hauf</a>, <a href="/search/?searchtype=author&query=Hogue%2C+B+G">Brenda G. Hogue</a>, <a href="/search/?searchtype=author&query=Horke%2C+D+A">Daniel A. Horke</a>, <a href="/search/?searchtype=author&query=Hosseinizadeh%2C+A">Ahmad Hosseinizadeh</a> , et al. (38 additional authors not shown) </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="1912.10796v1-abstract-short" style="display: inline;"> The emergence of high repetition-rate X-ray free-electron lasers (XFELs) powered by superconducting accelerator technology enables the measurement of significantly more experimental data per day than was previously possible. The European XFEL will soon provide 27,000 pulses per second, more than two orders of magnitude more than any other XFEL. The increased pulse rate is a key enabling factor for… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.10796v1-abstract-full').style.display = 'inline'; document.getElementById('1912.10796v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1912.10796v1-abstract-full" style="display: none;"> The emergence of high repetition-rate X-ray free-electron lasers (XFELs) powered by superconducting accelerator technology enables the measurement of significantly more experimental data per day than was previously possible. The European XFEL will soon provide 27,000 pulses per second, more than two orders of magnitude more than any other XFEL. The increased pulse rate is a key enabling factor for single-particle X-ray diffractive imaging, which relies on averaging the weak diffraction signal from single biological particles. Taking full advantage of this new capability requires that all experimental steps, from sample preparation and delivery to the acquisition of diffraction patterns, are compatible with the increased pulse repetition rate. Here, we show that single-particle imaging can be performed using X-ray pulses at megahertz repetition rates. The obtained results pave the way towards exploiting high repetition-rate X-ray free-electron lasers for single-particle imaging at their full repetition rate. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.10796v1-abstract-full').style.display = 'none'; document.getElementById('1912.10796v1-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> 14 December, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Commun. Phys. 3, 97 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.06271">arXiv:1905.06271</a> <span> [<a href="https://arxiv.org/pdf/1905.06271">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</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.123.246001">10.1103/PhysRevLett.123.246001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Gas-induced segregation in Pt-Rh alloy nanoparticles observed by in-situ Bragg coherent diffraction imaging </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Kawaguchi%2C+T">Tomoya Kawaguchi</a>, <a href="/search/?searchtype=author&query=Keller%2C+T+F">Thomas F. Keller</a>, <a href="/search/?searchtype=author&query=Runge%2C+H">Henning Runge</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Seitz%2C+C">Christoph Seitz</a>, <a href="/search/?searchtype=author&query=Kim%2C+Y+Y">Young Y. Kim</a>, <a href="/search/?searchtype=author&query=Maxey%2C+E+R">Evan R. Maxey</a>, <a href="/search/?searchtype=author&query=Cha%2C+W">Wonsuk Cha</a>, <a href="/search/?searchtype=author&query=Ulvestad%2C+A">Andrew Ulvestad</a>, <a href="/search/?searchtype=author&query=Hruszkewycz%2C+S+O">Stephan O. Hruszkewycz</a>, <a href="/search/?searchtype=author&query=Harder%2C+R">Ross Harder</a>, <a href="/search/?searchtype=author&query=Vartanyants%2C+I+A">Ivan A. Vartanyants</a>, <a href="/search/?searchtype=author&query=Stierle%2C+A">Andreas Stierle</a>, <a href="/search/?searchtype=author&query=You%2C+H">Hoydoo You</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="1905.06271v1-abstract-short" style="display: inline;"> Bimetallic catalysts can undergo segregation or redistribution of the metals driven by oxidizing and reducing environments. Bragg coherent diffraction imaging (BCDI) was used to relate displacement fields to compositional distributions in crystalline Pt-Rh alloy nanoparticles. 3D images of internal composition showed that the radial distribution of compositions reverses partially between the surfa… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.06271v1-abstract-full').style.display = 'inline'; document.getElementById('1905.06271v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.06271v1-abstract-full" style="display: none;"> Bimetallic catalysts can undergo segregation or redistribution of the metals driven by oxidizing and reducing environments. Bragg coherent diffraction imaging (BCDI) was used to relate displacement fields to compositional distributions in crystalline Pt-Rh alloy nanoparticles. 3D images of internal composition showed that the radial distribution of compositions reverses partially between the surface shell and the core when gas flow changes between O2 and H2. Our observation suggests that the elemental segregation of nanoparticle catalysts should be highly active during heterogeneous catalysis and can be a controlling factor in synthesis of electrocatalysts. In addition, our study exemplifies applications of BCDI for in situ 3D imaging of internal equilibrium compositions in other bimetallic alloy nanoparticles. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.06271v1-abstract-full').style.display = 'none'; document.getElementById('1905.06271v1-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 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 123, 246001 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1811.06855">arXiv:1811.06855</a> <span> [<a href="https://arxiv.org/pdf/1811.06855">pdf</a>, <a href="https://arxiv.org/format/1811.06855">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-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.101.013820">10.1103/PhysRevA.101.013820 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ghost Imaging at an XUV Free-Electron Laser </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Kim%2C+Y+Y">Young Yong Kim</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Dziarzhytski%2C+S">Siarhei Dziarzhytski</a>, <a href="/search/?searchtype=author&query=Beye%2C+M">Martin Beye</a>, <a href="/search/?searchtype=author&query=Bocklage%2C+L">Lars Bocklage</a>, <a href="/search/?searchtype=author&query=Classen%2C+A">Anton Classen</a>, <a href="/search/?searchtype=author&query=David%2C+C">Christian David</a>, <a href="/search/?searchtype=author&query=Gorobtsov%2C+O+Y">Oleg Yu. Gorobtsov</a>, <a href="/search/?searchtype=author&query=Khubbutdinov%2C+R">Ruslan Khubbutdinov</a>, <a href="/search/?searchtype=author&query=Lazarev%2C+S">Sergey Lazarev</a>, <a href="/search/?searchtype=author&query=Mukharamova%2C+N">Nastasia Mukharamova</a>, <a href="/search/?searchtype=author&query=Obukhov%2C+Y+N">Yury N. Obukhov</a>, <a href="/search/?searchtype=author&query=R%7Foesner%2C+B">Benedikt Roesner</a>, <a href="/search/?searchtype=author&query=Schlage%2C+K">Kai Schlage</a>, <a href="/search/?searchtype=author&query=Zaluzhnyy%2C+I+A">Ivan A. Zaluzhnyy</a>, <a href="/search/?searchtype=author&query=Brenner%2C+G">Guenter Brenner</a>, <a href="/search/?searchtype=author&query=R%7Foehlsberger%2C+R">Ralf Roehlsberger</a>, <a href="/search/?searchtype=author&query=von+Zanthier%2C+J">Joachim von Zanthier</a>, <a href="/search/?searchtype=author&query=Wurth%2C+W">Wilfried Wurth</a>, <a href="/search/?searchtype=author&query=Vartanyants%2C+I+A">Ivan A. Vartanyants</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="1811.06855v1-abstract-short" style="display: inline;"> Radiation damage is one of the most severe resolution limiting factors in x-ray imaging, especially relevant to biological samples. One way of circumventing this problem is to exploit correlation-based methods developed in quantum imaging. Among these, there is ghost imaging (GI) in which the image is formed by radiation that has never interacted with the sample. Here, we demonstrate GI at an XUV… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.06855v1-abstract-full').style.display = 'inline'; document.getElementById('1811.06855v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1811.06855v1-abstract-full" style="display: none;"> Radiation damage is one of the most severe resolution limiting factors in x-ray imaging, especially relevant to biological samples. One way of circumventing this problem is to exploit correlation-based methods developed in quantum imaging. Among these, there is ghost imaging (GI) in which the image is formed by radiation that has never interacted with the sample. Here, we demonstrate GI at an XUV free-electron laser by utilizing correlation techniques. We discuss the experimental challenges, optimal setup, and crucial ingredients to maximize the achievable resolution. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.06855v1-abstract-full').style.display = 'none'; document.getElementById('1811.06855v1-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> 16 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">19 pages, 7 figures, 52 references</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, 013820 (2020) </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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