Atmospheric implications for formation of clusters of ammonium and 1-10 water molecules.

Atmospheric implications for formation of clusters of ammonium and 1-10 water molecules.
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DOI:
10.1021/jp911493b
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发表时间:
2010-04-01
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
Shields GC
Shields GC
中科院分区:
其他
文献类型:
--
作者:
Morrell TE;Shields GC

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采用分子动力学/量子力学混合模型研究了铵水分子团簇体系。使用高水平的MP2计算方法和相关的基组,如aug-cc-pVDZ和aug-cc-pVTZ的信心外推能量的准确性。这些计算提供了在两种不同温度下形成铵和一到十个水分子簇的电子能和自由能。结构和热力学值与以前的实验和理论结果符合得很好。这些集群在对流层中的估计浓度是使用大气中的铵和水的量来计算的。结果表明,形成这些集群和离子诱导的成核在大气中的影响的可扩展性。
A mixed molecular dynamics/quantum mechanics model has been applied to the ammonium water clustering system. The use of the high level MP2 calculation method and correlated basis sets such as aug-cc-pVDZ and aug-cc-pVTZ lends confidence in the accuracy of the extrapolated energies. These calculations provide electronic and free energies for the formation of clusters of ammonium and one to ten water molecules at two different temperatures. Structures and thermodynamic values are in good agreement with previous experimental and theoretical results. The estimated concentration of these clusters in the troposphere was calculated using atmospheric amounts of ammonium and water. Results show the favorability of forming these clusters and implications for ion-induced nucleation in the atmosphere.
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影响因子: 1.7
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