Hydration of Atmospherically Relevant Molecular Clusters: Computational Chemistry and Classical Thermodynamics

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• 作者：Henning Henschel ; Juan C. Acosta Navarro ; Taina Yli-Juuti ; Oona Kupiainen-M盲盲tt盲 ; Tinja Olenius ; Ismael K. Ortega ; Simon L. Clegg ; Theo Kurt茅n ; Ilona Riipinen ; Hanna Vehkam盲ki
• 刊名：Journal of Physical Chemistry A
• 出版年：2014
• 出版时间：April 10, 2014
• 年：2014
• 卷：118
• 期：14
• 页码：2599-2611
• 全文大小：685K
• 年卷期：v.118,no.14(April 10, 2014)
• ISSN：1520-5215

文摘

Formation of new particles through clustering of molecules from condensable vapors is a significant source for atmospheric aerosols. The smallest clusters formed in the very first steps of the condensation process are, however, not directly observable by experimental means. We present here a comprehensive series of electronic structure calculations on the hydrates of clusters formed by up to four molecules of sulfuric acid, and up to two molecules of ammonia or dimethylamine. Though clusters containing ammonia, and certainly dimethylamine, generally exhibit lower average hydration than the pure acid clusters, populations of individual hydrates vary widely. Furthermore, we explore the predictions obtained using a thermodynamic model for the description of these hydrates. The similar magnitude and trends of hydrate formation predicted by both methods illustrate the potential of combining them to obtain more comprehensive models. The stabilization of some clusters relative to others due to their hydration is highly likely to have significant effects on the overall processes that lead to formation of new particles in the atmosphere.