Differential Cross Sections for the H＋D2O→HD＋OD Reaction： a Full Dimensional State-to-State Quantum Dynamics Study

作     者：Zhi-qiang Zhao Shu Liu Dong H. Zhang 赵志强;刘舒;张东辉

作者机构：State Key Laboratory of Molecular Reaction Dynamics and Center for Theoretical Computational Chemistry Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China University of Chinese Academy of Sciences Beijing 100049 China 

出 版 物：《Chinese Journal of Chemical Physics》 (化学物理学报（英文）)

年 卷 期：2017年第30卷第1期

页      面：16-24,I0001页

核心收录：

学科分类：07[理学] 

基　　金：This work was supported by the National Natural Science Foundation of China (No.21403223  No.21433009  and No.91221301)  the Ministry of Science and Technology of China (No.2013CB834601)  and the Chinese Academy of Sciences 

主　　题：State-to-state Differential cross section Time-dependent wave-packet method 

摘      要：The time-dependent wave-packet method was employed to calculate the first full-dimensional state-to-state differential cross sections （DCS） for the title reaction with D2O in the ground and the first symmetric （100） and asymmetric stretching （001） excited states. The calculated DCSs for these three initial states are strongly backward peaked at low collision energies. With the increase of collision energy, these DCSs become increasingly broader with the peak position shifting gradually to a smaller angle, consistent with the fact that the title reaction is a direct reaction via an abstraction mechanism. It is found that the （100） and （001） states not only have roughly the same integral cross sections, but also have essentially identical DCS, which are very close to that for the ground state at the same total energy of reaction. The reaction produces a small fraction of OD in the v=1 state, with the population close to the relative reactivity between the ground and vibrationally excited states, therefore confirming the experimental result of Zare et al. and the local mode picture [J. Phys. Chem. 97, 2204 （1993）]. Unexpectedly, the stretching excitation reduces the rotation excitation of product HD at the same total energy.