化学学报 ›› 2008, Vol. 66 ›› Issue (16): 1915-1918. 上一篇    下一篇

研究论文

基态Li2O+分子的结构和势能面研究

黄多辉*,a,b 王藩侯a 朱正和c

  

  1. (a宜宾学院计算物理重点实验室 宜宾 644007)
    (b宜宾学院物理与电子信息系 宜宾 644007)
    (c四川大学原子分子物理研究所 成都 610065)

  • 投稿日期:2007-11-11 修回日期:2008-03-03 发布日期:2008-08-28
  • 通讯作者: 黄多辉

Structure and Potential Energy Surface of Li2O+ Molecule for the Ground State

HUANG, Duo-Hui *,a,b WANG, Fan-Hou a ZHU, Zheng-He c

  

  1. (a Key Laboratory of Computational Physics, Yibin University, Yibin 644007)
    (b Department of Physics and Electronic Information, Yibin University, Yibin 644007)
    (c Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065)
  • Received:2007-11-11 Revised:2008-03-03 Published:2008-08-28
  • Contact: HUANG Duo-hui

以6-311++G(d)为基函数, 采用CASSCF方法优化出Li2O+分子的稳定构型为线形Li-O-Li (C∞V), 电子组态为2∏, 并对平衡核间距、离解能和基态简正频率进行了计算. 根据原子分子反应静力学原理, 导出了Li2O+分子的合理的离解极限. 并运用多体展式理论方法首次导出了基态Li2O+分子的分析势能函数, 绘出了势能等值图, 其势能等值图准确地再现了Li2O+分子的平衡结构特征.

关键词: Li2O+, CASSCF, 多体展式理论方法, 势能面

The CASSCF method with 6-311++G(d) basis has been used to optimize the possible structure of Li2O+ molecule. The results show that the ground state of Li2O+ molecule takes a C∞V symmetry and 2∏ state. The equilibrium geometry, dissociation energy and harmonic frequency were calculated. The reasonable dissociation limits of the ground state of Li2O+ molecule were obtained according to the atomic and molecular reaction statics. Analytical potential energy function for the Li2O+ molecule has been derived by using a many-body expansion method, and the contours of potential energy function have been depicted, which was successfully used for describing the equilibrium geometry for the Li2O+ molecule.

Key words: Li2O+, CASSCF, many-body expansion method, potential energy surface