运用电子相关耦合簇方法QCISD和基组6-311++G(3df,3pd)优化计算了H2,HCl分子基态的平衡间距、能量、离解能.对H2分子、HCl分子基态进行了单点能扫描计算,采用最小二乘法拟舍标准Murrell—Sorbie函数得到了相应的势能函数,以及相应的光谱常数、力常数,计算结果与实验数据吻合.
The equilibrium structure and dissociation energy of H2 and HCl molecules at the ground state are calculated and optimized using quantum chemistry methods QCISD at the 6-311+ +G(3df, 3pd)basis set. The equilibrium nuclear distance is in good agreement with experiment data. The analytic potential energy functions of H2 and HCl at the ground state are derived by least square fitting to the Murrell-Sorbie function, and the force constants and the optical constants are calculated. All calculating results are in good agreement with the experimental data.