<?xml version="1.0" encoding="UTF-8"?> <rss version="2.0" xmlns:media="http://search.yahoo.com/mrss/" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/"> <channel> <title>CERN Document Server</title> <link>https://cds.cern.ch</link> <description>CERN Document Server latest documents</description> <language>en</language> <pubDate>Sat, 30 Nov 2024 07:30:55 GMT</pubDate> <category></category> <generator>Invenio 1.1.3.1106-62468</generator> <ttl>360</ttl> <atom:link rel="self" href="/rss?f=author&amp;ln=it&amp;p=Surdu%2C+Mihnea" /> <opensearch:totalResults>6</opensearch:totalResults> <opensearch:startIndex>1</opensearch:startIndex> <opensearch:itemsPerPage>25</opensearch:itemsPerPage> <image> <url>https://cds.cern.ch/img/site_logo_rss.png</url> <title>CERN Document Server</title> <link>https://cds.cern.ch</link> </image> <atom:link rel="search" href="https://cds.cern.ch/opensearchdescription" type="application/opensearchdescription+xml" title="Content Search" /> <textInput> <title>Search </title> <description>Search this site:</description> <name>p</name> <link>https://cds.cern.ch/search</link> </textInput> <item> <title>Molecular Understanding of the Enhancement in Organic Aerosol Mass at High Relative Humidity</title> <link>https://cds.cern.ch/record/2891665</link> <description>The mechanistic pathway by which high relative humidity (RH) affects gas–particle partitioning remains poorly understood, although many studies report increased secondary organic aerosol (SOA) yields at high RH. Here, we use real-time, molecular measurements of both the gas and particle phase to provide a mechanistic understanding of the effect of RH on the partitioning of biogenic oxidized organic molecules (from α-pinene and isoprene) at low temperatures (243 and 263 K) at the CLOUD chamber at CERN. We observe increases in SOA mass of 45 and 85% with increasing RH from 10–20 to 60–80% at 243 and 263 K, respectively, and attribute it to the increased partitioning of semi-volatile compounds. At 263 K, we measure an increase of a factor 2–4 in the concentration of C10H16O2–3, while the particle-phase concentrations of low-volatility species, such as C10H16O6–8, remain almost constant. This results in a substantial shift in the chemical composition and volatility distribution toward less oxygenated and more volatile species at higher RH (e.g., at 263 K, O/C ratio = 0.55 and 0.40, at RH = 10 and 80%, respectively). By modeling particle growth using an aerosol growth model, which accounts for kinetic limitations, we can explain the enhancement in the semi-volatile fraction through the complementary effect of decreased compound activity and increased bulk-phase diffusivity. Our results highlight the importance of particle water content as a diluting agent and a plasticizer for organic aerosol growth.</description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Surdu, Mihnea</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lamkaddam, Houssni</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wang, Dongyu S</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bell, David M</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Xiao, Mao</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lee, Chuan Ping</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Li, Dandan</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Caudillo, Lucía</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Marie, Guillaume</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Scholz, Wiebke</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wang, Mingyi</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lopez, Brandon</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Piedehierro, Ana A</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Ataei, Farnoush</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Baalbaki, Rima</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bertozzi, Barbara</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bogert, Pia</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Brasseur, Zoé</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Dada, Lubna</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Duplissy, Jonathan</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Finkenzeller, Henning</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">He, Xu-Cheng</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Höhler, Kristina</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Korhonen, Kimmo</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Krechmer, Jordan E</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lehtipalo, Katrianne</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Mahfouz, Naser G A</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Manninen, Hanna E</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Marten, Ruby</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Massabò, Dario</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Mauldin, Roy</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Petäjä, Tuukka</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Pfeifer, Joschka</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Philippov, Maxim</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Rörup, Birte</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Simon, Mario</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Shen, Jiali</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Umo, Nsikanabasi Silas</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Vogel, Franziska</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Weber, Stefan K</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Zauner-Wieczorek, Marcel</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Volkamer, Rainer</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Saathoff, Harald</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Möhler, Ottmar</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kirkby, Jasper</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Worsnop, Douglas R</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kulmala, Markku</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Stratmann, Frank</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Hansel, Armin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Curtius, Joachim</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Welti, André</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Riva, Matthieu</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Donahue, Neil M</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Baltensperger, Urs</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">El Haddad, Imad</dc:creator> <pubDate>Thu, 14 Mar 2024 16:52:53 GMT</pubDate> <guid>https://cds.cern.ch/record/2891665</guid> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2891665/files/surdu-et-al-2023-molecular-understanding-of-the-enhancement-in-organic-aerosol-mass-at-high-relative-humidity.pdf"/> <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/" xml:lang="fr"/> <dc:hasPart xmlns:dc="http://purl.org/dc/elements/1.1/">['']</dc:hasPart> <dc:hasVersion xmlns:dc="http://purl.org/dc/elements/1.1/"/> </item> <item> <title>An intercomparison study of four different techniques for measuring the chemical composition of nanoparticles</title> <link>https://cds.cern.ch/record/2891194</link> <description>Currently, the complete chemical characterization of nanoparticles (&amp;lt; 100 nm) represents an analytical challenge, since these particles are abundant in number but have negligible mass. Several methods for particle-phase characterization have been recently developed to better detect and infer more accurately the sources and fates of sub-100 nm particles, but a detailed comparison of different approaches is missing. Here we report on the chemical composition of secondary organic aerosol (SOA) nanoparticles from experimental studies of α-pinene ozonolysis at −50, −30, and −10 ∘C and intercompare the results measured by different techniques. The experiments were performed at the Cosmics Leaving OUtdoor Droplets (CLOUD) chamber at the European Organization for Nuclear Research (CERN). The chemical composition was measured simultaneously by four different techniques: (1) thermal desorption–differential mobility analyzer (TD–DMA) coupled to a NO3- chemical ionization–atmospheric-pressure-interface–time-of-flight (CI–APi–TOF) mass spectrometer, (2) filter inlet for gases and aerosols (FIGAERO) coupled to an I− high-resolution time-of-flight chemical ionization mass spectrometer (HRToF-CIMS), (3) extractive electrospray Na+ ionization time-of-flight mass spectrometer (EESI-TOF), and (4) offline analysis of filters (FILTER) using ultra-high-performance liquid chromatography (UHPLC) and heated electrospray ionization (HESI) coupled to an Orbitrap high-resolution mass spectrometer (HRMS). Intercomparison was performed by contrasting the observed chemical composition as a function of oxidation state and carbon number, by estimating the volatility and comparing the fraction of volatility classes, and by comparing the thermal desorption behavior (for the thermal desorption techniques: TD–DMA and FIGAERO) and performing positive matrix factorization (PMF) analysis for the thermograms. We found that the methods generally agree on the most important compounds that are found in the nanoparticles. However, they do see different parts of the organic spectrum. We suggest potential explanations for these differences: thermal decomposition, aging, sampling artifacts, etc. We applied PMF analysis and found insights of thermal decomposition in the TD–DMA and the FIGAERO.</description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Caudillo, Lucía</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Surdu, Mihnea</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lopez, Brandon</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wang, Mingyi</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Thoma, Markus</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bräkling, Steffen</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Buchholz, Angela</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Simon, Mario</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wagner, Andrea C</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Müller, Tatjana</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Granzin, Manuel</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Heinritzi, Martin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Amorim, Antonio</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bell, David M</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Brasseur, Zoé</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Dada, Lubna</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Duplissy, Jonathan</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Finkenzeller, Henning</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">He, Xu-Cheng</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lamkaddam, Houssni</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Mahfouz, Naser G A</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Makhmutov, Vladimir</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Manninen, Hanna E</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Marie, Guillaume</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Marten, Ruby</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Mauldin, Roy L</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Mentler, Bernhard</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Onnela, Antti</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Petäjä, Tuukka</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Pfeifer, Joschka</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Philippov, Maxim</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Piedehierro, Ana A</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Rörup, Birte</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Scholz, Wiebke</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Shen, Jiali</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Stolzenburg, Dominik</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Tauber, Christian</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Tian, Ping</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Tomé, António</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Umo, Nsikanabasi Silas</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wang, Dongyu S</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wang, Yonghong</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Weber, Stefan K</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Welti, André</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Zauner-Wieczorek, Marcel</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Baltensperger, Urs</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Flagan, Richard C</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Hansel, Armin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kirkby, Jasper</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kulmala, Markku</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lehtipalo, Katrianne</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Worsnop, Douglas R</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Haddad, Imad El</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Donahue, Neil M</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Vogel, Alexander L</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kürten, Andreas</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Curtius, Joachim</dc:creator> <pubDate>Sat, 09 Mar 2024 05:40:06 GMT</pubDate> <guid>https://cds.cern.ch/record/2891194</guid> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2891194/files/acp-23-6613-2023.pdf"/> <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/" xml:lang="fr"/> <dc:hasPart xmlns:dc="http://purl.org/dc/elements/1.1/">['']</dc:hasPart> <dc:hasVersion xmlns:dc="http://purl.org/dc/elements/1.1/"/> </item> <item> <title>Iodine oxoacids enhance nucleation of sulfuric acid particles in the atmosphere</title> <link>https://cds.cern.ch/record/2886038</link> <description>The main nucleating vapor in the atmosphere is thought to be sulfuric acid (H2SO4), stabilized by ammonia (NH3). However, in marine and polar regions, NH3 is generally low, and H2SO4 is frequently found together with iodine oxoacids [HIOx, i.e., iodic acid (HIO3) and iodous acid (HIO2)]. In experiments performed with the CERN CLOUD (Cosmics Leaving OUtdoor Droplets) chamber, we investigated the interplay of H2SO4 and HIOx during atmospheric particle nucleation. We found that HIOx greatly enhances H2SO4(-NH3) nucleation through two different interactions. First, HIO3 strongly binds with H2SO4 in charged clusters so they drive particle nucleation synergistically. Second, HIO2 substitutes for NH3, forming strongly bound H2SO4-HIO2 acid-base pairs in molecular clusters. Global observations imply that HIOx is enhancing H2SO4(-NH3) nucleation rates 10- to 10,000-fold in marine and polar regions.</description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">He, Xu-Cheng</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Simon, Mario</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Iyer, Siddharth</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Xie, Hong-Bin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Rörup, Birte</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Shen, Jiali</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Finkenzeller, Henning</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Stolzenburg, Dominik</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Zhang, Rongjie</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Baccarini, Andrea</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Tham, Yee Jun</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wang, Mingyi</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Amanatidis, Stavros</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Piedehierro, Ana A</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Amorim, Antonio</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Baalbaki, Rima</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Brasseur, Zoé</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Caudillo, Lucía</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Chu, Biwu</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Dada, Lubna</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Duplissy, Jonathan</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Haddad, Imad El</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Flagan, Richard C</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Granzin, Manuel</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Hansel, Armin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Heinritzi, Martin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Hofbauer, Victoria</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Jokinen, Tuija</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kemppainen, Deniz</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kong, Weimeng</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Krechmer, Jordan</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kürten, Andreas</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lamkaddam, Houssni</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lopez, Brandon</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Ma, Fangfang</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Mahfouz, Naser G A</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Makhmutov, Vladimir</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Manninen, Hanna E</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Marie, Guillaume</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Marten, Ruby</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Massabò, Dario</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Mauldin, Roy L</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Mentler, Bernhard</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Onnela, Antti</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Petäjä, Tuukka</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Pfeifer, Joschka</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Philippov, Maxim</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Ranjithkumar, Ananth</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Rissanen, Matti P</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Schobesberger, Siegfried</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Scholz, Wiebke</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Schulze, Benjamin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Surdu, Mihnea</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Thakur, Roseline C</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Tomé, António</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wagner, Andrea C</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wang, Dongyu</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wang, Yonghong</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Weber, Stefan K</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Welti, André</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Winkler, Paul M</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Zauner-Wieczorek, Marcel</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Baltensperger, Urs</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Curtius, Joachim</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kurtén, Theo</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Worsnop, Douglas R</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Volkamer, Rainer</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lehtipalo, Katrianne</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kirkby, Jasper</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Donahue, Neil M</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Sipilä, Mikko</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kulmala, Markku</dc:creator> <pubDate>Wed, 10 Jan 2024 05:26:10 GMT</pubDate> <guid>https://cds.cern.ch/record/2886038</guid> <media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2886038/files/IodineSulfur_manuscript_CCBY.gif?subformat=icon"/> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2886038/files/IodineSulfur_manuscript_CCBY.pdf"/> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2886038/files/IodineSulfur_manuscript_CCBY.jpg?subformat=icon-180"/> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2886038/files/IodineSulfur_manuscript_CCBY.jpg?subformat=icon-1440"/> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2886038/files/IodineSulfur_manuscript_CCBY.jpg?subformat=icon-640"/> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2886038/files/IodineSulfur_manuscript_CCBY.jpg?subformat=icon-700"/> <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/" xml:lang="fr"/> <dc:hasPart xmlns:dc="http://purl.org/dc/elements/1.1/">['']</dc:hasPart> <dc:hasVersion xmlns:dc="http://purl.org/dc/elements/1.1/"/> </item> <item> <title>High Gas-Phase Methanesulfonic Acid Production in the OH-Initiated Oxidation of Dimethyl Sulfide at Low Temperatures</title> <link>https://cds.cern.ch/record/2852836</link> <description>Dimethyl sulfide (DMS) influences climate via cloud condensation nuclei (CCN) formation resulting from its oxidation products (mainly methanesulfonic acid, MSA, and sulfuric acid, H2SO4). Despite their importance, accurate prediction of MSA and H2SO4 from DMS oxidation remains challenging. With comprehensive experiments carried out in the Cosmics Leaving Outdoor Droplets (CLOUD) chamber at CERN, we show that decreasing the temperature from +25 to −10 °C enhances the gas-phase MSA production by an order of magnitude from OH-initiated DMS oxidation, while H2SO4 production is modestly affected. This leads to a gas-phase H2SO4-to-MSA ratio (H2SO4/MSA) smaller than one at low temperatures, consistent with field observations in polar regions. With an updated DMS oxidation mechanism, we find that methanesulfinic acid, CH3S(O)OH, MSIA, forms large amounts of MSA. Overall, our results reveal that MSA yields are a factor of 2−10 higher than those predicted by the widely used Master Chemical Mechanism (MCMv3.3.1), and the NOx effect is less significant than that of temperature. Our updated mechanism explains the high MSA production rates observed in field observations, especially at low temperatures, thus, substantiating the greater importance of MSA in the natural sulfur cycle and natural CCN formation. Our mechanism will improve the interpretation of present-day and historical gas-phase H2SO4/MSA measurements.</description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Shen, Jiali</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Scholz, Wiebke</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">He, Xu-Cheng</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Zhou, Putian</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Marie, Guillaume</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wang, Mingyi</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Marten, Ruby</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Surdu, Mihnea</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Rörup, Birte</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Baalbaki, Rima</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Amorim, Antonio</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Ataei, Farnoush</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bell, David M</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bertozzi, Barbara</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Brasseur, Zoé</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Caudillo, Lucía</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Chen, Dexian</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Chu, Biwu</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Dada, Lubna</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Duplissy, Jonathan</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Finkenzeller, Henning</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Granzin, Manuel</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Guida, Roberto</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Heinritzi, Martin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Hofbauer, Victoria</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Iyer, Siddharth</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kemppainen, Deniz</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kong, Weimeng</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Krechmer, Jordan E</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kürten, Andreas</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lamkaddam, Houssni</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lee, Chuan Ping</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lopez, Brandon</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Mahfouz, Naser G A</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Manninen, Hanna E</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Massabò, Dario</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Mauldin, Roy L</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Mentler, Bernhard</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Müller, Tatjana</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Pfeifer, Joschka</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Philippov, Maxim</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Piedehierro, Ana A</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Roldin, Pontus</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Schobesberger, Siegfried</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Simon, Mario</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Stolzenburg, Dominik</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Tham, Yee Jun</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Tomé, António</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Umo, Nsikanabasi Silas</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wang, Dongyu</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wang, Yonghong</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Weber, Stefan K</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Welti, André</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wollesen de Jonge, Robin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wu, Yusheng</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Zauner-Wieczorek, Marcel</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Zust, Felix</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Baltensperger, Urs</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Curtius, Joachim</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Flagan, Richard C</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Hansel, Armin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Möhler, Ottmar</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Petäjä, Tuukka</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Volkamer, Rainer</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kulmala, Markku</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lehtipalo, Katrianne</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Rissanen, Matti</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kirkby, Jasper</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">El-Haddad, Imad</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bianchi, Federico</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Sipilä, Mikko</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Donahue, Neil M</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Worsnop, Douglas R</dc:creator> <pubDate>Sat, 18 Mar 2023 05:52:18 GMT</pubDate> <guid>https://cds.cern.ch/record/2852836</guid> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2852836/files/acs.est.2c05154.pdf"/> <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/" xml:lang="fr"/> <dc:hasPart xmlns:dc="http://purl.org/dc/elements/1.1/">['']</dc:hasPart> <dc:hasVersion xmlns:dc="http://purl.org/dc/elements/1.1/"/> </item> <item> <title>Molecular characterization of ultrafine particles using extractive electrospray time-of-flight mass spectrometry</title> <link>https://cds.cern.ch/record/2842555</link> <description>Aerosol particles negatively affect human health while also having climatic relevance due to, for example, their ability to act as cloud condensation nuclei. Ultrafine particles (diameter D$_p$ &amp;lt; 100 nm) typically comprise the largest fraction of the total number concentration, however, their chemical characterization is difficult because of their low mass. Using an extractive electrospray time-of-flight mass spectrometer (EESI-TOF), we characterize the molecular composition of freshly nucleated particles from naphthalene and b-caryophyllene oxidation products at the CLOUD chamber at CERN. We perform a detailed intercomparison of the organic aerosol chemical composition measured by the EESI-TOF and an iodide adduct chemical ionization mass spectrometer equipped with a filter inlet for gases and aerosols (FIGAERO-I-CIMS). We also use an aerosol growth model based on the condensation of organic vapors to show that the chemical composition measured by the EESI-TOF is consistent with the expected condensed oxidation products. This agreement could be further improved by constraining the EESI-TOF compound-specific sensitivity or considering condensed-phase processes. Our results show that the EESI-TOF can obtain the chemical composition of particles as small as 20 nm in diameter with mass loadings as low as hundreds of ng m$^{-3}$ in real time. This was until now difficult to achieve, as other online instruments are often limited by size cutoffs, ionization/thermal fragmentation and/or semicontinuous sampling. Using real-time simultaneous gas- and particle-phase data, we discuss the condensation of naphthalene oxidation products on a molecular level.</description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Surdu, Mihnea</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Pospisilova, Veronika</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Xiao, Mao</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wang, Mingyi</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Mentler, Bernhard</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Simon, Mario</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Stolzenburg, Dominik</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Hoyle, Christopher R</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bell, David M</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lee, Chuan Ping</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lamkaddam, Houssni</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lopez-Hilfiker, Felipe</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Ahonen, Lauri R</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Amorim, Antonio</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Baccarini, Andrea</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Chen, Dexian</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Dada, Lubna</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Duplissy, Jonathan</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Finkenzeller, Henning</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">He, Xu-Cheng</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Hofbauer, Victoria</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kim, Changhyuk</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kürten, Andreas</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kvashnin, Aleksandr</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lehtipalo, Katrianne</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Makhmutov, Vladimir</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Molteni, Ugo</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Nie, Wei</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Onnela, Antti</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Petäjä, Tuukka</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Quéléver, Lauriane L J</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Tauber, Christian</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Tomé, António</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wagner, Robert</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Yan, Chao</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Prevot, Andre S H</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Dommen, Josef</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Donahue, Neil M</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Hansel, Armin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Curtius, Joachim</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Winkler, Paul M</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kulmala, Markku</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Volkamer, Rainer</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Flagan, Richard C</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Kirkby, Jasper</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Worsnop, Douglas R</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Slowik, Jay G</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wang, Dongyu S</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Baltensperger, Urs</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">el Haddad, Imad el</dc:creator> <pubDate>Wed, 30 Nov 2022 09:59:17 GMT</pubDate> <guid>https://cds.cern.ch/record/2842555</guid> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2842555/files/d1ea00050k.pdf"/> <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/" xml:lang="fr"/> <dc:hasPart xmlns:dc="http://purl.org/dc/elements/1.1/">['']</dc:hasPart> <dc:hasVersion xmlns:dc="http://purl.org/dc/elements/1.1/"/> </item> <item> <title>Chemical composition of nanoparticles from α-pinene nucleation and the influence of isoprene and relative humidity at low temperature</title> <link>https://cds.cern.ch/record/2807912</link> <description>Biogenic organic precursors play an important role in atmospheric new particle formation (NPF). One of the major precursor species is α-pinene, which upon oxidation can form a suite of products covering a wide range of volatilities. Highly oxygenated organic molecules (HOMs) comprise a fraction of the oxidation products formed. While it is known that HOMs contribute to secondary organic aerosol (SOA) formation, including NPF, they have not been well studied in newly formed particles due to their very low mass concentrations. Here we present gas- and particle-phase chemical composition data from experimental studies of α-pinene oxidation, including in the presence of isoprene, at temperatures (−50 and −30$^{◦}$C) and relative humidities (20 % and 60 %) relevant in the upper free troposphere. The measurements took place at the CERN Cosmics Leaving Outdoor Droplets (CLOUD) chamber. The particle chemical composition was analyzed by a thermal desorption differential mobility analyzer (TD-DMA) coupled to a nitrate chemical ionization– atmospheric pressure interface–time-of-flight (CI-APi-TOF) mass spectrometer. CI-APi-TOF was used for particle- and gas-phase measurements, applying the same ionization and detection scheme. Our measurements revealed the presence of C$_{8−10}$ monomers and C$_{18−20}$ dimers as the major compounds in the particles (diameter up to ∼ 100 nm). Particularly, for the system with isoprene added, C$_{5}$ (C$_{5}$H$_{10}$O$_{5−7}$) and C$_{15}$ compounds (C$_{15}$H$_{24}$O$_{5−10}$) were detected. This observation is consistent with the previously observed formation of such compounds in the gas phase. However, although the C$_{5}$ and C$_{15}$ compounds do not easily nucleate, our measurements indicate that they can still contribute to the particle growth at free tropospheric conditions. For the experiments reported here, most likely isoprene oxidation products enhance the growth of particles larger than 15 nm. Additionally, we report on the nucleation rates measured at 1.7 nm (J1.7 nm) and compared with previous studies, we found lower J1.7 nm values, very likely due to the higher α-pinene and ozone mixing ratios used in the present study</description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Caudillo, Lucía</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Rörup, Birte</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Heinritzi, Martin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Marie, Guillaume</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Simon, Mario</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wagner, Andrea C</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Müller, Tatjana</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Granzin, Manuel</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Amorim, Antonio</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Ataei, Farnoush</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Baalbaki, Rima</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bertozzi, Barbara</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Brasseur, Zoé</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Chiu, Randall</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Chu, Biwu</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Dada, Lubna</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Duplissy, Jonathan</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Finkenzeller, Henning</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Gonzalez Carracedo, Loïc</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">He, Xu-Cheng</dc:creator> <dc:creator 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Bernhard</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Molteni, Ugo</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Onnela, Antti</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Pfeifer, Joschka</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Philippov, Maxim</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Piedehierro, Ana A</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Schervish, Meredith</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Scholz, Wiebke</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Schulze, Benjamin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Shen, Jiali</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Stolzenburg, Dominik</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Stozhkov, Yuri</dc:creator> <dc:creator 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