Significance of ammonia in growth of atmospheric nanoclusters

被引：59

作者：

Torpo, Leena ^{[1
]}

Kurten, Theo ^{[1
]}

Vehkamaki, Hanna ^{[1
]}

Laasonen, Kari ^{[2
]}

Sundberg, Markku R. ^{[3
]}

Kulmala, Markku ^{[1
]}

机构：

[1] Univ Helsinki, Dept Phys Sci, Div Atmospher Sci, FI-00014 Helsinki, Finland

[2] Univ Oulu, Dept Chem, FI-90014 Oulu, Finland

[3] Univ Helsinki, Dept Chem, Inorgan Chem Lab, FI-00014 Helsinki, Finland

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2007年 / 111卷 / 42期

关键词：

D O I：

10.1021/jp0741307

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We apply accurate quantum chemistry methods to study the thermochemistry of molecular clusters containing ammonia, water, and sulfuric acid and investigate initial reaction steps in atmospheric nucleation by calculating free energies for the related reactions. The results indicate that ammonia is a key reactant enhancing the growth of small water-sulfuric acid clusters in atmospheric conditions. The role of ammonia becomes significant when the nanoclusters contain more than one or two sulfuric acid molecules. This implies a lower limit of 1:3 for the NH3/H2SO4 mole ratio of atmospheric sulfuric acid-water-ammonia clusters.

引用

页码：10671 / 10674

页数：4

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