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1.
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Insight into Acid–Base Nucleation Experiments by Comparison of the Chemical Composition of Positive, Negative, and Neutral Clusters
/ Bianchi, Federico (PSI, Villigen) ; Praplan, Arnaud P (Helsinki U.) ; Sarnela, Nina (Helsinki U.) ; Dommen, Josef (PSI, Villigen) ; Kürten, Andreas (Goethe U., Frankfurt (main)) ; Ortega, Ismael K (Lille U.) ; Schobesberger, Siegfried (Helsinki U.) ; Junninen, Heikki (Helsinki U.) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Tröstl, Jasmin (PSI, Villigen) et al.
We investigated the nucleation of sulfuric acid together with two bases (ammonia and dimethylamine), at the CLOUD chamber at CERN. The chemical composition of positive, negative, and neutral clusters was studied using three Atmospheric Pressure interface-Time Of Flight (APi-TOF) mass spectrometers: two were operated in positive and negative mode to detect the chamber ions, while the third was equipped with a nitrate ion chemical ionization source allowing detection of neutral clusters. [...]
2014 - 10 p.
- Published in : Environ. Sci. Technol. 48 (2014) 13675-13684
Fulltext: PDF;
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2.
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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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3.
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Experimental particle formation rates spanning tropospheric sulfuric acid and ammonia abundances, ion production rates, and temperatures
/ Kürten, Andreas ; Bianchi, Federico ; Almeida, Joao (CERN) ; Kupiainen-Määttä, Oona ; Dunne, Eimear M. ; Duplissy, Jonathan (CERN) ; Williamson, Christina ; Barmet, Peter ; Breitenlechner, Martin ; Dommen, Josef et al.
Binary nucleation of sulfuric acid and water as well as ternary nucleation involving ammonia arethought to be the dominant processes responsible for new particle formation (NPF) in the cold temperaturesof the middle and upper troposphere. Ions are also thought to be important for particle nucleation inthese regions. [...]
2016 - 24 p.
- Published in : J. Geophys. Res. Atmos. 121 (2016) 12,377-12,400
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4.
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Comparison of the SAWNUC model with CLOUD measurements of sulphuric acid-water nucleation
/ Ehrhart, Sebastian (CERN) ; Ickes, Luisa ; Almeida, Joao (CERN) ; Amorim, Antonio ; Barmet, Peter ; Bianchi, Federico ; Dommen, Josef ; Dunne, Eimear M ; Duplissy, Jonathan ; Franchin, Alessandro et al.
Binary nucleation of sulphuric acid-water particles is expected to be an important process in the free troposphere at low temperatures. SAWNUC (Sulphuric Acid Water Nucleation) is a model of binary nucleation that is based on laboratory measurements of the binding energies of sulphuric acid and water in charged and neutral clusters. [...]
2016 - 15 p.
- Published in : J. Geophys. Res. Atmos. 121 (2016) 12,401-12,414
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5.
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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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6.
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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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7.
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Neutral molecular cluster formation of sulfuric acid–dimethylamine observed in real time under atmospheric conditions
/ Kürten, Andreas (Goethe U., Frankfurt (main)) ; Jokinen, Tuija (Helsinki U.) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Sipilä, Mikko (Helsinki U. ; Helsinki Inst. of Phys.) ; Sarnela, Nina (Helsinki U.) ; Junninen, Heikki (Helsinki U.) ; Adamov, Alexey (Helsinki U.) ; Almeida, João (Goethe U., Frankfurt (main) ; CERN) ; Amorim, Antonio (UBI, Covilha ; U. Lisbon (main)) ; Bianchi, Federico (PSI, Villigen) et al.
For atmospheric sulfuric acid (SA) concentrations the presence of dimethylamine (DMA) at mixing ratios of several parts per trillion by volume can explain observed boundary layer new particle formation rates. However, the concentration and molecular composition of the neutral (uncharged) clusters have not been reported so far due to the lack of suitable instrumentation. [...]
arXiv:1509.03474.-
2014
- Published in : Proc. Natl. Acad. Sci. U.S.A. 111 (2014) 15019-15024
External link: Fulltext
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8.
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Oxidation Products of Biogenic Emissions Contribute to Nucleation of Atmospheric Particles
/ Riccobono, Francesco (PSI, Villigen) ; Schobesberger, S (Helsinki U.) ; Baltensperger, Urs (PSI, Villigen) ; Worsnop, Douglas R (Helsinki U. ; Aerodyne Research, Billerica) ; Curtius, Joachim (Goethe U., Frankfurt (main)) ; Carslaw, Kenneth S (U. Leeds (main)) ; Wimmer, Daniela (Goethe U., Frankfurt (main)) ; Wex, Heike (TROPOS, Leibniz) ; Weingartner, Ernest (PSI, Villigen) ; Wagner, Paul E (Finnish Meteorological Inst.) et al.
Atmospheric new-particle formation affects climate and is one of the least understood atmospheric aerosol processes. The complexity and variability of the atmosphere has hindered elucidation of the fundamental mechanism of new-particle formation from gaseous precursors. [...]
2014
- Published in : Science 344 (2014) 717-721
Data S1: TXT; Data S2: TXT; Data S3: TXT; Data S4: TXT; Supplementary materials: PDF; External link: Free access (choose "reprint")
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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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10.
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Role of sulphuric acid, ammonia and galactic cosmic rays in atmospheric aerosol nucleation
/ Kirkby, Jasper (CERN) ; Curtius, Joachim (Goethe U., Frankfurt) ; Almeida, João (Goethe U., Frankfurt ; SIM, Lisbon U. ; Beira Interior U., Lisbon) ; Dunne, Eimear (Leeds U.) ; Duplissy, Jonathan (CERN ; Helsinki U. ; Helsinki Inst. of Phys.) ; Ehrhart, Sebastian (Goethe U., Frankfurt) ; Franchin, Alessandro (Helsinki U.) ; Gagné, Stéphanie (Helsinki U. ; Helsinki Inst. of Phys.) ; Ickes, Luisa (Goethe U., Frankfurt) ; Kürten, Andreas (Goethe U., Frankfurt) et al.
Atmospheric aerosols exert an important influence on climate1 through their effects on stratiform cloud albedo and lifetime2 and the invigoration of convective storms3. Model calculations suggest that almost half of the global cloud condensation nuclei in the atmospheric boundary layer may originate from the nucleation of aerosols from trace condensable vapours4, although the sensitivity of the number of cloud condensation nuclei to changes of nucleation rate may be small5, 6. [...]
2011
- Published in : Nature 476 (2011) 429-433
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