摘要
Abstract
Potential energy curves（PECs） for the ground state and several low-lying electronic excited states of BeCl molecule are calculated using the multi-reference configuration interaction method with the basis set of aug-cc-pVTZ where the Davidson correction is considered as an approximation to full CI.The symmetries and dissociation limits for these electronic states are determined through group theory.The PECs of ground state（X~2Σ~＋） and first excited state（A~2∏） are fitted to the Murrell-Sorbie potential function,and from the fitting parameters the spectroscopic constants are determined to be D_e = 3.74 eV,R_e = 0.18173 nm（0.17970）,w_e = 857.4 cm~（-1） （847.2）,w_ex_e = 5.03 cm~（-1）（5.14）.B_e = 0.7103 cm~（-1）（0.7285）,andα_e = 0.0059 cm~（-1）（0.0069）（where the values in parentheses are the cited experimental results） for X~2Σ~＋ state and D_e.= 3.02 eV,R_e,= 0.18369 nm（0.18211）,w_e = 832.7 cm~（-1）（822.1）, w_er_e = 5.93 cm~（-1）（5.24）,D_e = 0.6953 cm~（-1）（0.7094）,andα_e = 0.0065 cm~（-1）（0.0068） for A~2∏state of BeCl.All the calculation results are in good agreement with the experimental values.In addition,we use the level program to calculate the radial Schrodinger equation of nuclear motion to obtain the vibrational levels for the X~2Σ~＋ and A~2∏states.关键词
BeCl/多参考组态相互作用计算/激发态势能曲线/光谱常数Key words
BeCl/multi-reference configuration interaction calculation/potential energy curves of excited states/spectroscopic constants分类
数理科学
