计算物理 ›› 2006, Vol. 23 ›› Issue (5): 594-598.

• 论文 • 上一篇    下一篇

B2分子X3Σg-和A3Σu-态的势能函数

谢安东1,2, 朱正和1,2   

  1. 1. 井冈山学院物理系, 江西 吉安 343009;
    2. 四川大学原子与分子物理研究所, 四川 成都 610065
  • 收稿日期:2005-05-23 修回日期:2006-01-16 出版日期:2006-09-25 发布日期:2006-09-25
  • 作者简介:谢安东(1964-),吉安,教授,博士,从事原子与分子物理研究,井冈山学院学位学科建设办公室.
  • 基金资助:
    国家自然科学基金(10376022);江西省教育厅科技项目(2006261)资助项目

Potential Energies of Electronic States X3Σg- and A3Σu- of a B2 Molecule

XIE An-dong1,2, ZHU Zheng-he1,2   

  1. 1. Department of Physics, College of Jinggangshan, Ji'an 343009, China;
    2. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
  • Received:2005-05-23 Revised:2006-01-16 Online:2006-09-25 Published:2006-09-25

摘要: 使用SAC/SAC-CI方法,利用D95(d),6-311g**以及cc-PVTZ等基组,对B2分子的基态(X3Σg-)和第一激发态(A3Σu-)的平衡结构和谐振频率进行了优化计算.通过对3个基组的计算结果的比较,得出了D95(d)基组为3个基组中的最优基组的结论;使用D95(d)基组,利用SAC的GSUM(Group Sum of Operators)方法对基态(X3Σg-),SAC-CI的GSUM方法对激发态(A3Σu-)进行单点能扫描计算,用正规方程组拟合Murrell-Sorbie函数,得到了相应电子态的完整势能函数;从得到的势能函数计算了与基态(X3Σg-)和第一激发态(A3Σu-)相对应的光谱常数(Be,αe,ωeωeχe),结果与实验数据吻合.

关键词: 原子与分子物理, 分子结构与势能函数, B2, 激发态, Murrell-Sorbie函数

Abstract: The energies,equilibrium geometries and harmonic frequencies of the ground state X3Σg- and the first excited state A3Σu- of a B2 molecule are calculated using the GSUM(Group Sum of Operators) method of SAC/SAC-CI with the basic sets(D95(d),) 6-311g** and cc-PVTZ.It is found that the basis set D95(d) is suitable for the energy calculation of a B2 molecule.The potential curves are scanned using the SAC/D95(d) method for the ground state and the SAC-CI/D95(d) methods for the excited states.A least square is fitted to a Murrell-Sorbie function.The spectroscopy constants(Be,αe,ωe,and ωeχe) are calculated which are in good agreement with experiment.It is believed that the Murrell-Sorbie function and the SAC/SAC-CI method are suitable not only for the ground state,but also for low-lying excited states.

Key words: atomic and molecular physics, molecular structure and potential function, B2, excited state, Murrell-Sorbie function

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