Effects of reactant rotational excitation on Cl + CH4 / CHD3 reactions

Pan, Huilin

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https://hdl.handle.net/2142/51163 Copy

Description

Title

Effects of reactant rotational excitation on Cl + CH4 / CHD3 reactions

Author(s)

Pan, Huilin

Contributor(s)

• Liu, Kopin
• Lin, Jui-San
• Cheng, Yuan
• Wang, Fengyan

Issue Date

2014-06-18

Keyword(s)

Mini-symposium: Spectroscopy in Kinetics and Dynamics

Abstract

Effects of reactant rotation, which can disentangle the stereodynamical properties of chemical reactivity, are of great importance in understanding and controlling the steric effects in chemical reactions. Here, we report the rotational quantum-state control of a late-barrier reaction of chlorine atom with CH$_{4}$ and CHD$_{3}$ in a crossed molecular beam experiment. Experimental results demonstrate that, in both reactions, the more detailed product translational and angular distributions are essentially the same for different rotational states of the vibrationally excited CH$_{4}$ and CHD$_{3}$ reactants. Yet, the integral cross sections show strong dependence on the reactant rotational excitation, suggesting that the reactivity diversity arises from the anisotropic interactions enroute to the reaction barrier. More detailed analysis indicates that the effects of reactant rotation do not derive from the rotational-energy effects or long-range forces, rather are the result of short-range forces in the transition state region. Exactly how the transition-state properties, e.g., the barrier location and the tightness of barrier, influence the rotational reactivity diversity, however, remains unclear. Further investigations are on-going to gain deeper insights.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/51163

DOI

https://doi.org/10.15278/isms.2014.WH09

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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