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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Quantum Mechanical and Rice-Ramsperger-Kassel-Marcus Investigation of the Thermal Unimolecular Decomposition of CF_2BrO and CF_2ClO Radicals
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Quantum Mechanical and Rice-Ramsperger-Kassel-Marcus Investigation of the Thermal Unimolecular Decomposition of CF_2BrO and CF_2ClO Radicals

机译:CF_2BrO和CF_2ClO自由基的热单分子分解的量子力学和Rice-Ramsperger-Kassel-Marcus研究

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摘要

Quantum mechanical and Rice-Ramsperger-Kassel-Marcus calculations are carried out to study the thermal unimolecular decomposition of CF_2XO radicals (X=Br,Cl).Two kinds of dissociation mechanisms are possible,carbon-halogen bond scission and intramolecular three-center XF elimination.It should be noted that the three-center direct XF elimination has only been able to be characterized at the B3LYP level.X-atom elimination is shown to be the dominant reaction pathway,whereas C-F bond scission and XF elimination have been found to exhibit high energy barriers.On the basis of the ab initio data,energy-specific rate constants k(E) and thermal rate constants k(T,P) are evaluated using master equation numerical analysis.
机译:进行了量子力学和莱斯-兰斯珀格-卡塞尔-马库斯计算,研究了CF_2XO自由基(X = Br,Cl)的热单分子分解。可能有两种解离机理:碳-卤素键断裂和分子内三中心XF应该指出的是,三中心直接XF消除只能在B3LYP水平上进行表征.X原子消除被证明是主要的反应途径,而CF键断裂和XF消除被认为是主要的反应途径。在从头算数据的基础上,使用主方程数值分析评估了特定于能量的速率常数k(E)和热速率常数k(T,P)。

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