物理化学学报 >> 2004, Vol. 20 >> Issue (08): 877-881.doi: 10.3866/PKU.WHXB20040819

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CASSCF方法对H2O激发态势能面的研究

王珺;郭迎春;杨晓华;吴升海;刘煜炎;陈扬骎   

  1. 华东师范大学物理系,光谱学和波谱学教育部重点实验室,上海 200062
  • 收稿日期:2004-01-06 修回日期:2004-03-16 发布日期:2004-08-15
  • 通讯作者: 郭迎春 E-mail:ycguo@phy.ecnu.edu.cn

Quantum Chemical Calculation of the Excited State Potential Energy Surface of H2O Using the CASSCF Method

Wang Jun;Guo Ying-Chun;Yang Xiao-Hua;Wu Sheng-Hai;Liu Yu-Yan;Chen Yang-Qin   

  1. Key Laboratory of Optical and Magnetic Resonance Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062
  • Received:2004-01-06 Revised:2004-03-16 Published:2004-08-15
  • Contact: Guo Ying-Chun E-mail:ycguo@phy.ecnu.edu.cn

摘要: 采用Gaussian 98程序中的CASSCF(完全活性空间自洽场)计算了H2O+激发态的势能面,并对计算结果进行拟合,得到了势能曲面的解析表达式.作者对活性空间和基组的选取做了分析,并将得到的势能面与广泛使用的MRD-CI结果进行了比较,结果基本一致.

关键词: 量化计算, 完全活性空间(CAS), 分子轨道, 势能面, Gaussian 98程序

Abstract: The excited potential surface of H2O+ is calculated using CASSCF method with Gaussian98 program, and then fitted to an analytical expression. At the same time, the selections of the complete active space (CAS) and the basis sets are discussed during CASSCF calculation. The potential surface obtained agrees very well with the result from MRD-CI method.

Key words: Quantum calculation, Complete active space(CAS), Molecular orbitals,  Potential energy surface, Gaussian 98 program