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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Vibrational vs. translational energy in promoting a prototype metal-hydrocarbon insertion reaction
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Vibrational vs. translational energy in promoting a prototype metal-hydrocarbon insertion reaction

机译:振动与平移能促进原型金属-碳氢化合物插入反应

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摘要

The reaction Y + CH_4 → HYCH_3 → YCH_2 + H_2 is initiated by C-H insertion involving a 20 ± 3 kcal/mol potential energy barrier. The reaction is studied in crossed molecular beams under two different conditions with nearly the same total energy. One experiment is carried out at a collision energy of 15.1 kcal/mol with one quantum of CH_4 antisymmetric (v_3) stretching vibrational excitation (8.63 kcal/mol), the other at a collision energy of 23.8 kcal/mol. The reaction cross-section for C-H stretch excited methane (σ_s) is found to be at least a factor of 2.2 times larger than for ground-state methane (σ_g) at the same total energy.
机译:Y + CH_4→HYCH_3→YCH_2 + H_2反应是通过C-H插入引发的,涉及20±3 kcal / mol势能垒。在具有几乎相同的总能量的两种不同条件下,在交叉分子束中研究了该反应。一个实验是在15.1 kcal / mol的碰撞能量下进行的,其中一个量子CH_4反对称(v_3)拉伸振动激发(8.63 kcal / mol),另一个实验的碰撞能量为23.8 kcal / mol。发现在相同的总能量下,C-H拉伸激发甲烷(σ_s)的反应截面至少是基态甲烷(σ_g)的2.2倍。

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