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MICROSCOPIC FRICTION AND SOLVATION IN BARRIER CROSSING - ISOMERIZATION OF STILBENE IN SIZE-SELECTED HEXANE CLUSTERS

机译:障碍物穿越中的微观摩擦和溶解-尺寸选择的己烷类中苯乙烯的异构化

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摘要

In order to understand the roles of bulk friction and solvation in barrier crossing reactions, here we report our first study of the isomerization rates for a beam of t-stilbene-hexane(n) clusters, n=1-5, at excess energies covering the range E(ex)= 0-4000 cm(-1). We observe that rates measured at excess energies well above the t-stilbene isomerization barrier decrease monotonically with increasing number of solvent molecules. The influence of microscopic solvation on the rates is systematically studied and related to changes in barrier height and internal friction, both key to the understanding of behavior in the bulk. [References: 23]
机译:为了理解体摩擦和溶剂化在障碍穿越反应中的作用,我们在此报告了我们的第一篇关于在过量能量覆盖下,n = 1-5的叔苯乙烯-己烷(n)簇束的异构化速率的研究。范围E(ex)= 0-4000 cm(-1)。我们观察到,随着溶剂分子数量的增加,在远高于叔二苯乙烯异构化势垒的过量能量下测得的速率单调降低。微观溶剂化率对速率的影响已得到系统研究,并且与势垒高度和内部摩擦的变化有关,这两者都是了解整体行为的关键。 [参考:23]

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