F?(H2O)+CH3I Ligand Exchange Reaction Dynamics  

F?(H2O)+CH3I配体交换反应动力学

作　　者：Bjorn Bastian Tim Michaelsen Milan Oncák Jennifer Meyer Roland Wester Bjorn Bastian;Tim Michaelsen;Milan Oncák;Jennifer Meyer;Roland Wester(奥地利因斯布鲁克大学离子物理与应用物理研究所,因斯布鲁克6020)

机构地区：[1]Institut für Ionenphysik und Angewandte Physik,Universitat Innsbruck,Technikerstraβe 25,6020 Innsbruck,Austria

出　　处：《Chinese Journal of Chemical Physics》2020年第2期210-216,I0003,I0039-I0040,共10页化学物理学报（英文）

基　　金：support by a Hertha-Firnberg fellowship of the Austrian Science Fund (T962-N34).

摘　　要：Single hydration of the gas phase F^-+CH3I→CH3F reaction allows to probe solvent effects on a fundamental nucleophilic substitution reaction.At the same time,the addition of a solvent molecule opens alternative product channels.Here,we present crossed beam imaging results on the dynamics of the F^-(H2O)+CH3I→[FCH3I]^-+H2O ligand exchange pathway at collision energies between 0.3 and 2.6 eV.Product kinetic energies are constrained by the stability requirement of the weakly bound product complexes.This implies substantial internal excitation of the water molecule and disfavors effcient energy redistribution in an intermediate complex,which is reflected by the suppression of low kinetic energies as collision energy increases.At 0.3 eV,internal nucleophilic displacement is important and is discussed in light of the competing nucleophilic substitution pathways that form I^- and I^-(H2O).

关 键 词：Reaction dynamics Ligand exchange MICROSOLVATION Crossed beams Velocity map imaging 

分 类 号：O641.4[理学—物理化学] O643.1[理学—化学]