摘要
基于Gaussian09程序包,选用单双取代的二次组态相互作用(QCISD)方法,配有多种基组,对BHn(n=0,+1)分子离子基态进行了几何优化,对BH和BH+分别选用6-311++G(3df,3pd)和6-311++G(df)基组,对其进行了频率计算和单点能扫描计算.用最小二乘法拟合得到了BHn(n=0,+1)分子离子基态的Murrell-Sorbie势能函数.与实验及理论结果比较表明,本文对BHn(n=0,+1)分子离子基态光谱常数(Be,αe,ωe,ωeχe)的计算结果达到了很高的精度.文章还首次给出BH+离子基态的势能函数及光谱参数(Be,αe,ωe,ωeχe)的理论数据,为BH+离子的进一步研究提供重要的参考.
Based on the Gaussian09 calculation software, QCISD method has been used to optimize the possible ground -state structures of BH molecule and BH~ molecule ion with the 6 -311 + + G(3df, 3pd) and 6 -311 + + G(df) basis sets respectively. Frequency and single -point energy scan for BHn( n = 0, + 1 ) have been Calculated. Spectral parameters (Be,αe,ωe,ωeχe) of the BHn ( n = 0, + 1 ) ground state are obtained by least square fitting to the Murrell - Sorbie function, All calculation results are in good agreement with experimental data. In this work, spectral parameters (Be,αe,ωe,ωeχe) and force constants (f2 ,f3 ,f4 ) of BH+ for ground state are shown for the first time. This calculation may provide a good testing ground for investigation of BH + later.
出处
《商丘师范学院学报》
CAS
2012年第3期51-55,共5页
Journal of Shangqiu Normal University
基金
河南省教育厅自然科学研究计划资助项目(2010C140002)
河南省基础与前沿技术研究计划资助项目(112300410025)