CERN Accelerating science

CERN Document Server 找到 29 筆記錄  1 - 10下一個最後  跳到記錄: 檢索需時 0.57 秒. 
1.
Iodine oxoacids enhance nucleation of sulfuric acid particles in the atmosphere / He, Xu-Cheng (Helsinki U. ; Carnegie Mellon U. ; Helsinki Inst. of Phys.) ; Simon, Mario (Frankfurt U., FIAS ; Frankfurt U.) ; Iyer, Siddharth (Tampere U. of Tech.) ; Xie, Hong-Bin (Shanghai Jiao Tong U.) ; Rörup, Birte (Helsinki U.) ; Shen, Jiali (Helsinki U.) ; Finkenzeller, Henning (Colorado U. ; Colorado U., CIRES) ; Stolzenburg, Dominik (Helsinki U. ; Vienna U.) ; Zhang, Rongjie (Shanghai Jiao Tong U.) ; Baccarini, Andrea (PSI, Villigen ; Ecole Polytechnique, Lausanne) et al.
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)]. [...]
2023 - 7 p. - Published in : Science 382 (2023) adh2526 Manuscript: PDF;
2.
The gas-phase formation mechanism of iodic acid as an atmospheric aerosol source / Finkenzeller, Henning (Colorado U. ; Colorado U., CIRES) ; Iyer, Siddharth (Tampere U. of Tech.) ; He, Xu-Cheng (Helsinki U.) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Koenig, Theodore K (Colorado U. ; Colorado U., CIRES ; Peking U., Beijing) ; Lee, Christopher F (Colorado U. ; Colorado U., CIRES) ; Valiev, Rashid (Helsinki U.) ; Hofbauer, Victoria (Carnegie Mellon U.) ; Amorim, Antonio (Lisbon U.) ; Baalbaki, Rima (Helsinki U.) et al.
AbstractIodine is a reactive trace element in atmospheric chemistry that destroys ozone and nucleates particles. Iodine emissions have tripled since 1950 and are projected to keep increasing with rising O3 surface concentrations. [...]
2022 - 7 p. - Published in : Nature Chem. 15 (2022) 129-135 Fulltext: PDF;
3.
High Gas-Phase Methanesulfonic Acid Production in the OH-Initiated Oxidation of Dimethyl Sulfide at Low Temperatures / Shen, Jiali ; Scholz, Wiebke ; He, Xu-Cheng ; Zhou, Putian ; Marie, Guillaume ; Wang, Mingyi ; Marten, Ruby ; Surdu, Mihnea ; Rörup, Birte ; Baalbaki, Rima et al.
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. [...]
2022 - 14 p. - Published in : Environ. Sci. Technol. 56 (2022) 13931-13944 Fulltext: PDF;
4.
Critical Role of Iodous Acid in Neutral Iodine Oxoacid Nucleation / Zhang, Rongjie ; Xie, Hong-Bin ; Ma, Fangfang ; Chen, Jingwen ; Iyer, Siddharth ; Simon, Mario ; Heinritzi, Martin ; Shen, Jiali ; Tham, Yee Jun ; Kurtén, Theo et al.
Nucleation of neutral iodine particles has recently been found to involve both iodic acid (HIO3) and iodous acid (HIO2). However, the precise role of HIO2 in iodine oxoacid nucleation remains unclear. [...]
2022 - 12 p. - Published in : Environ. Sci. Technol. 56 (2022) 14166-14177 Fulltext: PDF;
5.
Synergistic HNO3–H2SO4–NH3 upper tropospheric particle formation / Wang, Mingyi ; Xiao, Mao ; Bertozzi, Barbara ; Marie, Guillaume ; Rörup, Birte ; Schulze, Benjamin ; Bardakov, Roman ; He, Xu-Cheng ; Shen, Jiali ; Scholz, Wiebke et al.
New particle formation in the upper free troposphere is a major global source of cloud condensation nuclei (CCN). However, the precursor vapours that drive the process are not well understood. [...]
2022 - 7 p. - Published in : Nature 605 (2022) 483-489 Fulltext: PDF;
6.
Determination of the collision rate coefficient between charged iodic acid clusters and iodic acid using the appearance time method / He, Xu-Cheng (U. Helsinki (main)) ; Iyer, Siddharth (U. Helsinki (main)) ; Sipilä, Mikko (U. Helsinki (main)) ; Ylisirniö, Arttu (UEF, Kuopio) ; Peltola, Maija (Helsinki U.) ; Kontkanen, Jenni (Helsinki U.) ; Baalbaki, Rima (Helsinki U.) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Kürten, Andreas (Goethe U., Frankfurt (main)) ; Tham, Yee Jun (Helsinki U.) et al.
Ions enhance the formation rate of atmospheric aerosol particles, which play an important role in Earth’s radiative balance. Ion-induced nucleation involves the stepwise accretion of neutral monomers onto a molecular cluster containing an ion, which helps to stabilize the cluster against evaporation. [...]
2020 - 12 p. - Published in : Aerosol Sci. Technol. 55 (2020) 231-242 Fulltext: PDF;
7.
Measurement of iodine species and sulfuric acid using bromide chemical ionization mass spectrometers / Wang, Mingyi (Carnegie Mellon U.) ; He, Xu-Cheng (Helsinki U.) ; Finkenzeller, Henning (U. Colorado, Boulder) ; Iyer, Siddharth (Helsinki U.) ; Chen, Dexian (Carnegie Mellon U.) ; Shen, Jiali (Helsinki U.) ; Simon, Mario (Frankfurt U.) ; Hofbauer, Victoria (Carnegie Mellon U.) ; Kirkby, Jasper (CERN ; Frankfurt U.) ; Curtius, Joachim (Frankfurt U.) et al.
Iodine species are important in the marine atmosphere for oxidation and new-particle formation. Understanding iodine chemistry and iodine new-particle formation requires high time resolution, high sensitivity, and simultaneous measurements of many iodine species. [...]
2021 - 16 p. - Published in : Atmos. Meas. Tech. 14 (2021) 4187-4202 Fulltext: PDF; Supplement: PDF;
8.
Enhanced growth rate of atmospheric particles from sulfuric acid / Stolzenburg, Dominik (Vienna U. ; Helsinki U.) ; Simon, Mario (Frankfurt U.) ; Ranjithkumar, Ananth (Leeds U.) ; Kürten, Andreas (Frankfurt U.) ; Lehtipalo, Katrianne (Helsinki U. ; Finnish Meteorological Inst.) ; Gordon, Hamish (Leeds U.) ; Ehrhart, Sebastian (Mainz, Max Planck Inst.) ; Finkenzeller, Henning (U. Colorado, Boulder) ; Pichelstorfer, Lukas (Helsinki U.) ; Nieminen, Tuomo (Helsinki U.) et al.
In the present-day atmosphere, sulfuric acid is the most important vapour for aerosol particle formation and initial growth. However, the growth rates of nanoparticles ( < 10 nm) from sulfuric acid remain poorly measured. [...]
2020 - 14 p. - Published in : Atmos. Chem. Phys. 20 (2020) 7359-7372
9.
Molecular understanding of new-particle formation from α-pinene between −50 and +25 °C / Simon, Mario (Frankfurt U.) ; Dada, Lubna (Helsinki U.) ; Heinritzi, Martin (Frankfurt U.) ; Scholz, Wiebke (Innsbruck U.) ; Stolzenburg, Dominik (Vienna U.) ; Fischer, Lukas (Innsbruck U.) ; Wagner, Andrea C (Frankfurt U. ; U. Colorado, Boulder) ; Kürten, Andreas (Frankfurt U.) ; Rörup, Birte (Helsinki U.) ; He, Xu-Cheng (Helsinki U.) et al.
Highly oxygenated organic molecules (HOMs) contribute substantially to the formation and growth of atmospheric aerosol particles, which affect air quality, human health and Earth’s climate. HOMs are formed by rapid, gasphase autoxidation of volatile organic compounds (VOCs) such as α-pinene, the most abundant monoterpene in the atmosphere. [...]
2020 - 25 p. - Published in : Atmos. Chem. Phys. 20 (2020) 9183-9207
10.
Molecular understanding of the suppression of new-particle formation by isoprene / Heinritzi, Martin (Frankfurt U.) ; Dada, Lubna (Helsinki U.) ; Simon, Mario (Frankfurt U.) ; Stolzenburg, Dominik (Vienna U.) ; Wagner, Andrea C (Frankfurt U. ; U. Colorado, Boulder) ; Fischer, Lukas (Innsbruck U.) ; Ahonen, Lauri R (Helsinki U.) ; Amanatidis, Stavros (Caltech, Pasadena (main)) ; Baalbaki, Rima (Helsinki U.) ; Baccarini, Andrea (PSI, Villigen) et al.
Nucleation of atmospheric vapours produces more than half of global cloud condensation nuclei and so has an important influence on climate. Recent studies show that monoterpene (C10H16) oxidation yields highly oxygenated products that can nucleate with or without sulfuric acid. [...]
2020 - 13 p. - Published in : Atmos. Chem. Phys. 20 (2020) 11809-11821

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