高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (11): 2039.

• 论文 • 上一篇    下一篇

基态H2O+的全域多体势能面

翟高红, 王育彬, 石婷, 文振翼   

  1. 西北大学现代物理研究所, 西安 710069
  • 收稿日期:2003-01-05 出版日期:2003-11-24 发布日期:2003-11-24
  • 通讯作者: 文振翼(1937年出生),男,教授,博士生导师,从事量子化学理论和应用研究.E-mail:wzy@nwu.edu.cn E-mail:wzy@nwu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:20073032)资助

Global Many-body Potential Energy Surface of Ground State H2O+

ZHAI Gao-Hong, WANG Yu-Bin, SHI Ting, WEN Zhen-Yi   

  1. Institute of Modern Physics, Northwest University, Xi′an 710069, China
  • Received:2003-01-05 Online:2003-11-24 Published:2003-11-24

摘要: 基态H2O+分子离子是重要的星际反应中间体.用MRCISD/cc-pVTZ先计算H2O+势能面,然后拟合成多体势能函数.全域势能面能很好地描述基态H2O+的行为.与两条反应通道的实验能变和其构型翻转反应能垒比较,表明计算结果与实验值相符.对计算点完成了力场的多项式拟合,对其振动模式进行了分析

关键词: H2O+分子离子, 势能面, 振动模式分析

Abstract: Ground state H2O+is an important intermediate in atmospheric and interstellar chemistry.An accurate global ab initio potential energy surface is presented for the ground state H2O+molecular ion.The calculations were based on the externally contracted multi-reference configuration interaction method with all single and double excitations(EC-MRCISD) with cc-pVTZ basis.The surface was fitted as many-body function form suggested by Aguado and Paniagua and welLIndicates the behavior of the ground state H2O+. The calculated results of energy changeSIn the dissociation reaction and the active energy of geometry-inverse reaction are coincident witHExperimental results.Besides, the data points were fitted to a polynomial force field, and analysis of normal vibration modes was performed.

Key words: H2O+molecular ion, Potential energy surface, Vibration modes analysis

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