Rotational Mode Specificity in Cl + CH4(v3=1,|jNl⟩): Role of Reactant’s Vibrational Angular Momentum

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• 作者：Huilin Pan ; Yuan Cheng ; Kopin Liu
• 刊名：Journal of Physical Chemistry A
• 出版年：2016
• 出版时间：July 14, 2016
• 年：2016
• 卷：120
• 期：27
• 页码：4799-4804
• 全文大小：386K
• 年卷期：0
• ISSN：1520-5215

文摘

The effect of initial rotational states in the reaction of antisymmetric-excited CH₄(v₃=1,|jNl⟩) with Cl atom was investigated in a crossed-beam, product-imaging experiment over the collisional energy (E_c) range of 2–5 kcal mol^–1. We found that while the initial rotational excitations exert a noticeable effect on total reactivity, they leave little imprint on the more detailed product-state and angular distributions. This finding echoes the previous conclusion in the analogous Cl + CHD₃(v₁=1,|NK⟩) reaction. However, the rotational enhancement factor is substantial at low E_c and then becomes insignificant at higher E_c, in contrast to the Cl + CHD₃ case. A more intriguing finding is the role of the vibrational angular momentum (l) in promoting the reactivity. A heuristic picture is proposed to rationalize the observations.