B2C（^1A1）和BC2（^2A＇）的结构与解析势能函数  

The structure and potential energy function of B2C （^1A1） and BC2（^2A＇）

作　　者：刘玉芳[1] 韩晓琴[1] 吕广申[1] 孙金锋[1] 

机构地区：[1]河南师范大学物理系,新乡453007

出　　处：《物理学报》2007年第8期4412-4419,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10574039);教育部科学技术研究重点项目(批准号:206084);河南省高等学校杰出科研人才创新工程(批准号:2006KYCX002);河南省教育厅自然科学基金(批准号:200510476004)资助的课题.~~

摘　　要：采用单双取代的二次组态相互作用方法,分别选用6-311++G(d,p)和6-311G(df,pd)基组,对B2C和BC2分子的结构进行了优化,得到这两个分子的基态结构为C2v和Cs,基态电子状态为1A1和2A′,同时还得到了它们的平衡几何结构、离解能、谐振频率和力常数.在此计算的基础上,运用多体展式理论方法推导出B2C和BC2分子的解析势能函数,其等值势能面图准确再现了B2C和BC2分子的结构特征及势阱深度.由此讨论了B+BC→B2C,B+CC→BC2分子反应的势能面特征.Quadratic configuration interaction method including single and duble substitutions has been used to optimize the possible ground-state structures of B2C and BC2 molecules with the 6-311 ＋ ＋ G（d, f） and 6-311G（df, pd） basis set. The results show that the ground state of B2 C molecule is of C2v symmetry and of ^1A1 state, the ground state of BC2 molecule is of Cs symmetry and of ^2A＇ state. And the equilibrium geometry, dissociation energy, harmonic frequency and force constant have been calculated. The potential energy functions of B2C and BC2 have been derived from the many-body expansion theory. The potential energy functions describe correctly the configurations and the dissociation energies of the two ground-state molecules. Molecular reaction kinetics of B ＋ BC→B2 C and B ＋ CC→BC2 based on the potential energy functions is discussed briefly.

关 键 词：碳化硼 MURRELL-SORBIE函数 谐振频率 势能函数 

分 类 号：O561.1[理学—原子与分子物理]