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Quantum molecular dynamics study of the reaction of O-2 with HOCO

机译:O-2与HOCO反应的量子分子动力学研究

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摘要

The reaction of O-2 with HOCO has been studied by using an ab initio direct dynamics method based on the UB3PW91 density functional theory. Results show that the reaction can occur via two mechanisms: direct hydrogen abstraction and an addition reaction through a short-lived HOC(O)O-2 intermediate. The lifetime of the intermediate is predicted to be 660 +/- 30 fs. Although it is an activated reaction, the activation energy is only 0.71 kcal/mol. At room temperature, the obtained thermal rate coefficient is 2.1 X 10(-12) cm(3) molecule(-1) s(-1), which is in good agreement with the experimental results.
机译:通过基于UB3PW91密度泛函理论的从头算直接动力学方法研究了O-2与HOCO的反应。结果表明该反应可通过两种机理发生:直接氢提取和通过短寿命的HOC(O)O-2中间体进行加成反应。中间体的寿命预计为660 +/- 30 fs。虽然是活化反应,但活化能仅为0.71kcal / mol。在室温下,获得的热速率系数为2.1 X 10(-12)cm(3)分子(-1)s(-1),与实验结果吻合良好。

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