Hydration of Atmospherically Relevant Molecular Clusters: Computational Chemistry and Classical Thermodynamics
2014 (English)In: Journal of Physical Chemistry A, ISSN 1089-5639, E-ISSN 1520-5215, Vol. 118, no 14, 2599-2611 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2014. Vol. 118, no 14, 2599-2611 p.
Physical Chemistry Meteorology and Atmospheric Sciences
IdentifiersURN: urn:nbn:se:su:diva-103954DOI: 10.1021/jp500712yISI: 000334573000006OAI: oai:DiVA.org:su-103954DiVA: diva2:722883
FunderEU, European Research Council, StG 257360 MOCAPAFEU, European Research Council, StG 278277 ATMOGAIN