计算物理 ›› 2012, Vol. 29 ›› Issue (4): 566-574.

• 论文 • 上一篇    下一篇

六参数高精度双原子分子解析势能函数

于长丰1, 王志伟2   

  1. 1. 西安工程大学理学院物理系, 西安, 710048;
    2. 西安工程大学电子信息学院, 西安, 710048
  • 收稿日期:2011-08-16 修回日期:2011-12-20 出版日期:2012-09-25 发布日期:2012-09-25
  • 作者简介:于长丰(1962-),男,副教授,从事原子与分子物理研究,E-mail:yuh55@126.com
  • 基金资助:
    国家自然科学基金(11004156)资助项目

High Precision Analytic Diatomic Molecular Potential Functions with Six Parameters

YU Changfeng1, WANG Zhiwei2   

  1. 1. Department of Physics, College of Science, Xi'an Polytechnic University, Xi'an 710048, China;
    2. Electronic Information College, Xi'an Polytechnic University, Xi'an 710048, China
  • Received:2011-08-16 Revised:2011-12-20 Online:2012-09-25 Published:2012-09-25

摘要: 提出一种构造解析势能函数的新方法,得到一种六参数解析势能函数,该势能函数适用于多种基本类型的双原子分子.用同核中性基态双原子分子Li2-X1Σg+、Na2-X1Σg+,异核带电基态双原子分子离子(BC)--X3∏,异核中性激发态双原子分子PbS-A1Σ+、BaO-A1Σ,异核带电激发态双原子分子离子(CS)+-A2∏,同核中性激发态双原子分子K2-B1u,同核带电激发态双原子分子离子N2+-B2Σu+等共36个算例对该势能函数进行验证,计算结果与RKR(Rydberg-Klein-Rees)数据或振动能谱实验数据高精度符合.同时发现,在分子振动能谱计算精度方面,该势能函数总体上优于Murrell-Sorbie势能函数.

关键词: 势能函数, 双原子分子和离子, RKR方法, 力常数, 光谱参数

Abstract: A method for constructing analytical diatomic molecular potential energy functions is proposed.The potential energy function is examined with 36 diatomic molecules or ions-homonuclear ground-state of neutral diatomic molecules Li2-X1g+,Na2-X1g+,heternuclear ground-state of charged diatomic molecular ion (BC)--X3∏,heternuclear excitation-state neutral diatomic molecules PbS-A1+,BaO-A1∑,heternuclear excitation-state of charged diatomic molecular ion (CS)+-A2∏,homonuclear excitation-state of neutral diatomic molecule K2-B1u,homonuclear excitation-state for charged diatomic molecule N2+-B2u+ etc.Vibrational energy levels of molecules calculated are consistent with RKR data (Rydberg-Klein-Rees) and experimental data in high-precision.It shows that the potential energy function is superior to Murrell-Sorbie potential in calculating vibrational energy levels of molecules.

Key words: potential energy function, diatomic molecules and ions, RKR method, force constants, spectroscopic parameters

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