Velocity Map Imaging Study of the Reaction Dynamics of the H + CH4 鈫?H2 + CH3 Reaction: The Isotope Effects

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• 作者：Huilin Pan ; Jiayue Yang ; Quan Shuai ; Dong Zhang ; Weiqing Zhang ; Guorong Wu ; Dongxu Dai ; Bo Jiang ; Donghui Zhang ; Xueming Yang
• 刊名：Journal of Physical Chemistry A
• 出版年：2014
• 出版时间：April 3, 2014
• 年：2014
• 卷：118
• 期：13
• 页码：2426-2430
• 全文大小：301K
• 年卷期：v.118,no.13(April 3, 2014)
• ISSN：1520-5215

文摘

Following our previous study on the H + CD₄ 鈫?HD + CD₃ reaction [ Proc. Natl. Acad. Sci. U.S.A. 2010, 107, 12782], the reaction of H + CH₄ 鈫?H₂ + CH₃ at collision energies ranging from 0.72 to 1.99 eV is studied using crossed-beam and time-sliced velocity map ion imaging techniques. The product angular and translational energy distributions at four different collision energies were derived from the measured images. The excitation function was also measured from these images together with a careful calibration of the H atom beam intensities at different collision energies. All of these results are compared with those of the H + CD₄ reaction to investigate the isotope effects. The isotope effects are all observed in the product angular distributions, the translational energy distributions, and the excitation function and further confirm the reaction mechanism proposed in the previous study on the H + CD₄ reaction.