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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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Effect of ions on sulfuric acid-water binary particle formation: 1. Theory for kinetic- and nucleation-type particle formation and atmospheric implications / Merikanto, Joonas (Helsinki Inst. of Phys. ; Finnish Meteorological Inst.) ; Duplissy, Jonathan (Helsinki U. ; Helsinki Inst. of Phys.) ; Määttänen, Anni (Versailles U., Velizy ; LATMOS, Guyancourt ; Paris U., IV) ; Henschel, Henning (Helsinki U.) ; Donahue, Neil M (Carnegie Mellon U.) ; Brus, David (Finnish Meteorological Inst.) ; Schobesberger, Siegfried (Helsinki Inst. of Phys.) ; Kulmala, Markku (Helsinki U.) ; Vehkamäki, Hanna (Helsinki Inst. of Phys.)
We derive a version of Classical Nucleation Theory normalized by quantum chemical results on sulfuric acid-water hydration to describe neutral and ion-induced particle formation in the binary sulfuric acid-water system. The theory is extended to treat the kinetic regime where the nucleation free energy barrier vanishes at high sulfuric acid concentrations or low temperatures. [...]
2016 - 16 p. - Published in : J. Geophys. Res. 121 (2016) 1736-1751

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The effect of acid–base clustering and ions on the growth of atmospheric nano-particles / Lehtipalo, Katrianne (Helsinki U. ; PSI, Villigen) ; Rondo, Linda (Frankfurt U.) ; Kontkanen, Jenni (Helsinki U.) ; Schobesberger, Siegfried (Helsinki U. ; Washington U., Seattle) ; Jokinen, Tuija (Helsinki U.) ; Sarnela, Nina (Helsinki U.) ; Kürten, Andreas (Frankfurt U.) ; Ehrhart, Sebastian (Frankfurt U. ; CERN) ; Franchin, Alessandro (Helsinki U.) ; Nieminen, Tuomo (Helsinki U.) et al.
The growth of freshly formed aerosol particles can be the bottleneck in their survival to cloud condensation nuclei. It is therefore crucial to understand how particles grow in the atmosphere. [...]
2016 - Published in : Nature Commun. 7 (2016) 11594 Fulltext: PDF;

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How do organic vapors contribute to new-particle formation? / Donahue, Neil M (Carnegie Mellon U. (main)) ; Ortega, Ismael K (Helsinki U.) ; Chuang, Wayne (Carnegie Mellon U. (main)) ; Riipinen, Ilona (Carnegie Mellon U. (main) ; Helsinki U. ; Stockholm U. (main)) ; Riccobono, Francesco (PSI, Villigen) ; Schobesberger, Siegfried (Helsinki U.) ; Dommen, Josef (PSI, Villigen) ; Baltensperger, Urs (PSI, Villigen) ; Kulmala, Markku (Helsinki U.) ; Worsnop, Douglas R (Helsinki U. ; Aerodyne Research, Billerica) et al.
Highly oxidised organic vapors can effectively stabilize sulphuric acid in heteronuclear clusters and drive new-particle formation. We present quantum chemical calculations of cluster stability, showing that multifunctional species can stabilize sulphuric acid and also present additional polar functional groups for subsequent cluster growth. [...]
2013 - Published in : Faraday Discuss. 165 (2013) 91-104

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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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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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8	Vehkamaki, Hanna
1	Vehkamäki, H.

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