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| Titel |
Methane sulfonic acid-enhanced formation of molecular clusters of sulfuric acid and dimethyl amine |
| VerfasserIn |
N. Bork, J. Elm, T. Olenius, H. Vehkamäki |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 22 ; Nr. 14, no. 22 (2014-11-17), S.12023-12030 |
| Datensatznummer |
250119162
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| Publikation (Nr.) |
 copernicus.org/acp-14-12023-2014.pdf |
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| Zusammenfassung |
| Over oceans and
in coastal regions, methane sulfonic acid (MSA) is present in substantial
concentrations in aerosols and in the gas phase. We present an investigation
into the effect of MSA on sulfuric acid- and dimethyl amine (DMA)-based
cluster formation rates. From systematic conformational scans and well-tested
ab initio methods, we optimise the structures of all MSAx (H2SO4)yDMAz clusters where
x + y ≤ 3 and z ≤ 2. The resulting thermodynamic data
are used in the Atmospheric Cluster Dynamics Code, and the effect of MSA is
evaluated by comparing ternary MSA–H2SO4–DMA cluster formation rates
to binary H2SO4–DMA cluster formation rates. Within the range of
atmospherically relevant MSA concentrations, we find that MSA may increase
cluster formation rates by up to 1 order of magnitude, although typically,
the increase will be less than 300 % at 258 K, less than 100 % at 278 K
and less than 15 % at 298 K. The results are rationalised by a detailed
analysis of the main growth paths of the clusters. We find that MSA-enhanced
clustering involves clusters containing one MSA molecule, while clusters
containing more than one MSA molecule do not contribute significantly to the
growth. |
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