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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Measurement of the thermodynamics of the hydrated dimer and trimer of sulfuric acid
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Measurement of the thermodynamics of the hydrated dimer and trimer of sulfuric acid

机译：硫酸水合二聚体和三聚体的热力学测量

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摘要

We report measurements of the equilibrium constants, K-p, for the water mediated clustering of two and three sulfuric acid molecules for atmospheric temperatures and relative humidities. Limits for Kp for the formation of the sulfuric acid tetramer and higher clusters as well as the kinetics of small sulfuric acid cluster growth are also presented. These results put strong constraints on the rate of nucleation in the atmosphere via the H2SO4/H2O neutral mechanism. We show that the neutral nucleation of H2SO4 and H2O is slower than ion-induced nucleation of H2SO4 and H2O for most conditions found in the middle and upper troposphere. These laboratory-based upper limits to the nucleation rates are also much lower than the predictions of the liquid drop model/classical nucleation theory.
机译：我们报告了在大气温度和相对湿度下，水介导的两个和三个硫酸分子的簇化的平衡常数K-p的测量结果。还提出了形成硫酸四聚体和更高簇的Kp极限，以及小的硫酸簇生长的动力学。这些结果通过H2SO4 / H2O中性机制对大气中的成核速率施加了强烈的约束。我们表明，对于中高层对流层中的大多数情况，H2SO4和H2O的中性成核比离子诱导的H2SO4和H2O的成核要慢。这些基于实验室的成核速率上限也远低于液滴模型/经典成核理论的预测值。

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