Enhancing effect of dimethylamine in sulfuric acid nucleation in the presence of water - a computational study
Résumé
We have studied the hydration of sulfuric acid-ammonia and sulfuric acid-dimethylamine clusters using quantum chemistry. We calculated the formation energies and thermodynamics for clusters of one ammonia or one dimethylamine molecule together with 1-2 sulfuric acid and 0-5 water molecules. The results indicate that dimethy-lamine enhances the addition of sulfuric acid to the clusters much more efficiently than ammonia when the number of water molecules in the cluster is either zero, or greater than two. Further hydrate distribution calculations reveal that practically all dimethylamine-containing two-acid clusters will remain unhydrated in tropospherically relevant circumstances , thus strongly suggesting that dimethylamine assists atmospheric sulfuric acid nucleation much more effectively than ammonia.
Domaines
Chimie théorique et/ou physique| Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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