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1.
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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
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2.
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Formation of Highly Oxygenated Organic Molecules from $\alpha$-Pinene Ozonolysis: Chemical Characteristics, Mechanism, and Kinetic Model Development
/ Molteni, Ugo (PSI, Villigen) ; Simon, Mario (Frankfurt U.) ; Heinritzi, Martin (Frankfurt U.) ; Hoyle, Christopher R (PSI, Villigen) ; Bernhammer, Anne-Kathrin (Ionicon GesmbH, Innsbruck) ; Bianchi, Federico (Helsinki U.) ; Breitenlechner, Martin (Innsbruck U.) ; Brilke, Sophia (Frankfurt U.) ; Dias, António (Lisbon U.) ; Duplissy, Jonathan (Helsinki U. ; Helsinki Inst. of Phys.) et al.
Terpenes are emitted by vegetation, and their oxidation in the
atmosphere is an important source of secondary organic aerosol (SOA). A part of
this oxidation can proceed through an autoxidation process, yielding highly
oxygenated organic molecules (HOMs) with low saturation vapor pressure. [...]
2019 - 11 p.
- Published in : ACS Earth and Space Chemistry 3 (2019) 873-883
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3.
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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
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4.
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Molecular understanding of new-particle formation from $\alpha$-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
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5.
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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 (C$_{10}$H$_{16}$) 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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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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Rapid growth of new atmospheric particles by nitric acid and ammonia condensation
/ Wang, Mingyi (Carnegie Mellon U.) ; Kong, Weimeng (Caltech) ; Marten, Ruby (PSI, Villigen) ; He, Xu-Cheng (Helsinki U.) ; Chen, Dexian (Carnegie Mellon U.) ; Pfeifer, Joschka (CERN) ; Heitto, Arto (Kuopio U.) ; Kontkanen, Jenni (Helsinki U.) ; Dada, Lubna (Helsinki U.) ; Kürten, Andreas (Goethe U., Frankfurt (main)) et al.
Measurements in the CLOUD chamber at CERN show that the rapid condensation of ammonia and nitric acid vapours could be important for the formation and survival of new particles in wintertime urban conditions, contributing to urban smog..
2020 - 20 p.
- Published in : Nature 581 (2020) 184-189
Fulltext from Publisher: PDF;
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8.
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A new high-transmission inlet for the Caltech nano-RDMA for size distribution measurements of sub-3 nm ions at ambient concentrations
/ Franchin, Alessandro (Helsinki U.) ; Downard, Andy (Caltech, Pasadena (main)) ; Kangasluoma, Juha (Helsinki U.) ; Nieminen, Tuomo (Helsinki U. ; Helsinki Inst. of Phys. ; UEF, Kuopio) ; Lehtipalo, Katrianne (Helsinki U. ; Airmodus Ltd, Helsinki) ; Steiner, Gerhard (U. Vienna (main) ; Innsbruck U.) ; Manninen, Hanna E (Helsinki U.) ; Petäjä, Tuukka (Helsinki U.) ; Flagan, Richard C (Caltech, Pasadena (main)) ; Kulmala, Markku (Helsinki U.)
Reliable and reproducible measurements of atmospheric aerosol particle number size distributions below 10 nm require optimized classification instruments with high particle transmission efficiency. Almost all differential mobility analyzers (DMAs) have an unfavorable potential gradient at the outlet (e.g., long column, Vienna type) or at the inlet (nano-radial DMA), preventing them from achieving a good transmission efficiency for the smallest nanoparticles. [...]
2016 - 12 p.
- Published in : Atmos. Meas. Tech. 9 (2016) 2709-2720
Fulltext: PDF; External link: Fulltext
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9.
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Characterization of the mass-dependent transmission efficiency of a CIMS
/ Heinritzi, Martin (Goethe U., Frankfurt (main)) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Steiner, Gerhard (U. Vienna (main) ; Innsbruck U.) ; Wagner, Andrea C (Goethe U., Frankfurt (main)) ; Kürten, Andreas (Goethe U., Frankfurt (main)) ; Hansel, Armin (Innsbruck U.) ; Curtius, Joachim (Goethe U., Frankfurt (main))
Knowledge about mass discrimination effects in a chemical ionization mass spectrometer (CIMS) is crucial for quantifying, e.g., the recently discovered extremely low volatile organic compounds (ELVOCs) and other compounds for which no calibration standard exists so far. Here, we present a simple way of estimating mass discrimination effects of a nitrate-based chemical ionization atmospheric pressure interface time-of-flight (CI-APi-TOF) mass spectrometer. [...]
2016 - 12 p.
- Published in : Atmos. Meas. Tech. 9 (2016) 1449-1460
Fulltext: PDF; External link: Fulltext
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