Thermodynamics of the formation of sulfuric acid dimers in the binary (H2SO4-H2O) and ternary (H2SO4-H2O-NH3)system

Sulfuric acid is an important gas influencing atmospheric new particle formation (NPF). Both the binary (H2SO4-H2O) system, and the ternary system involving ammonia (H2SO4-H2O-NH3) may be important in the free tropospher
Sulfuric acid is an important gas influencing atmospheric new particle formation (NPF). Both the binary (H2SO4-H2O) system, and the ternary system involving ammonia (H2SO4-H2O-NH3) may be important in the free troposphere. An essential step in the nucleation of aerosol particles from gas-phase precursors is the formation of a dimer, so an understanding of the thermodynamics of dimer formation over a wide range of atmospheric conditions is essential to describe NPF. We have used the CLOUD chamber to conduct nucleation experiments for these systems at temperatures from 208 to 248 K. Neutral monomer and dimer concentrations of sulfuric acid were measured using a Chemical Ionization Mass Spectrometer (CIMS). From these measurements dimer evaporation rates in the binary system were derived for temperatures of 208 and 223 K. We compare these results to literature data from a previous study that was conducted at higher temperatures but is in good agreement with the present study. For the ternary system the formation of H2SO4·NH3 is very likely an essential step in the formation of sulfuric acid dimers, which were measured at 210, 223, and 248K. We estimate the thermodynamic properties (dH and dS) of the H2SO4·NH3 cluster using a simple heuristic model and the measured data. Furthermore, we report the first measurements of large neutral sulfuric acid clusters containing as many as 10 sulfuric acid molecules for the binary system using Chemical Ionization-Atmospheric Pressure interface-Time Of Flight (CI-APi-TOF) mass spectrometry.
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Metadaten
Author:Andreas Kürten, S. Münch, Linda Rondo, Federico Bianchi, Jonathan Duplissy, Tuija Jokinen, Heikki Junninen, Nina Sarnela, Siegfried Schobesberger, Mario Simon, Mikko Sipilä, Joao Almeida, Antonio Amorim, Josef Dommen, Neil McPherson Donahue, Eimear M. Dunne, Richard C. Flagan, Alessandro Franchin, Jasper Kirkby, Agnieszka Kupc, Vladimir Makhmutov, Tuukka Petäjä, Arnaud Patrick Praplan, Francesco Riccobono, Gerhard Steiner, Antonio Tomé, Georgios Tsagkogeorgas, Paul E. Wagner, Daniela Wimmer, Urs Baltensperger, Markku Kulmala, Douglas R. Worsnop, Joachim Curtius
URN:urn:nbn:de:hebis:30:3-395249
DOI:http://dx.doi.org/10.5194/acpd-15-13957-2015
ISSN:1680-7367
ISSN:1680-7375
Parent Title (German):Atmospheric chemistry and physics / Discussions, 15.2015, S. 13957–14006
Publisher:European Geosciences Union
Place of publication:Katlenburg-Lindau
Document Type:Article
Language:English
Date of Publication (online):2015/05/18
Date of first Publication:2015/05/18
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2016/03/14
Volume:15
Pagenumber:50
First Page:13957
Last Page:14006
Note:
© Author(s) 2015. CC Attribution 3.0 License.
HeBIS PPN:399786201
Institutes:Geowissenschaften
Dewey Decimal Classification:550 Geowissenschaften
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 3.0

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