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1.
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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;
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2.
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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;
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3.
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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;
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4.
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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;
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5.
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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;
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6.
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Role of iodine oxoacids in atmospheric aerosol nucleation
/ He, Xu-Cheng (Helsinki U.) ; Tham, Yee Jun (Helsinki U.) ; Dada, Lubna (Helsinki U.) ; Wang, Mingyi (Carnegie Mellon U.) ; Finkenzeller, Henning (U. Colorado, Boulder) ; Stolzenburg, Dominik (Vienna U. ; Helsinki U.) ; Iyer, Siddharth (Tampere U. of Tech.) ; Simon, Mario (Frankfurt U., FIAS) ; Kürten, Andreas (Frankfurt U., FIAS) ; Shen, Jiali (Helsinki U.) et al.
Iodic acid (HIO3) is known to form aerosol particles in coastal marine regions, but predicted nucleation and growth rates are lacking. Using the CERN CLOUD (Cosmics Leaving Outdoor Droplets) chamber, we find that the nucleation rates of HIO3 particles are rapid, even exceeding sulfuric acid–ammonia rates under similar conditions. [...]
2021 - 7 p.
- Published in : Science 371 (2021) 589-595
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7.
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Can Highly Oxidized Organics Contribute to Atmospheric New Particle Formation?
/ Ortega, Ismael K (PhLAM, Villeneuve d'Ascq ; Carnegie Mellon U. (main)) ; Donahue, Neil M (Carnegie Mellon U. (main)) ; Kurtén, Theo (U. Helsinki (main)) ; Kulmala, Markku (Helsinki U.) ; Focsa, Cristian (PhLAM, Villeneuve d'Ascq) ; Vehkamäki, Hanna (Helsinki U.)
Highly oxidized organic molecules may play a critical role in new-particle formation within Earth’s atmosphere along with sulfuric acid, which has long been considered as a key compound in this process. Here we explore the interactions of these two partners, using quantum chemistry to find the formation free energies of heterodimers and trimers as well as the fastest evaporation rates of (2,2) tetramers. [...]
2015 - 7 p.
- Published in : J. Phys. Chem. A 120 (2015) 1452-1458
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8.
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Molecular understanding of atmospheric particle formation from sulfuric acid and large oxidized organic molecules
/ Schobesberger, Siegfried (Helsinki U.) ; Junninen, Heikki (Helsinki U.) ; Bianchi, Federico (PSI, Villigen) ; Lönn, Gustaf (Helsinki U.) ; Ehn, Mikael (Helsinki U.) ; Lehtipalo, Katrianne (Helsinki U.) ; Dommen, Josef (PSI, Villigen) ; Ehrhart, Sebastian (Goethe U., Frankfurt (main)) ; Ortega, Ismael K (Helsinki U.) ; Franchin, Alessandro (Helsinki U.) et al.
Atmospheric aerosols formed by nucleation of vapors affect radiative forcing and therefore climate. However, the underlying mechanisms of nucleation remain unclear, particularly the involvement of organic compounds. [...]
2013
- Published in : Proc. Natl. Acad. Sci. U.S.A. 110 (2013) 17223-17228
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9.
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Molecular understanding of sulphuric acid-amine particle nucleation in the atmosphere
/ Almeida, João (Goethe U., Frankfurt ; CERN) ; Schobesberger, Siegfried (Helsinki U.) ; Kürten, Andreas (Goethe U., Frankfurt) ; Ortega, Ismael K (Helsinki U.) ; Kupiainen-Määttä, Oona (Helsinki U.) ; Praplan, Arnaud P (PSI, Villigen) ; Adamov, Alexey (Helsinki U.) ; Amorim, Antonio (U. Lisbon ; U. Beira Int., Lisbon) ; Bianchi, Federico (PSI, Villigen) ; Breitenlechner, Martin (U. Innsbruck) et al.
Nucleation of aerosol particles from trace atmospheric vapours is thought to provide up to half of global cloud condensation nuclei. Aerosols can cause a net cooling of climate by scattering sunlight and by leading to smaller but more numerous cloud droplets, which makes clouds brighter and extends their lifetimes. [...]
2013 - 11 p.
- Published in : Nature 502 (2013) 359-363
NPG Open Access article: PDF; Supplementary Information: PDF;
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