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 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 Subject(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. Issue Date: 2014-06-18 Publisher: International Symposium on Molecular Spectroscopy Citation Info: Pan, H.; Liu, K.; Lin, J.; Cheng, Y.; Wang, F. EFFECTS OF REACTANT ROTATIONAL EXCITATION ON Cl + CH4 / CHD3 REACTIONS. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.WH09 Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/51163 DOI: https://doi.org/10.15278/isms.2014.WH09 Rights Information: Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/ Date Available in IDEALS: 2014-09-172015-04-14
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