采用从头计算二阶自旋-轨道多组态准简并微扰理论计算了碘代甲烷CH3I分子与基态2I30/2和激发态2I10/*2原子解离极限相关联的势能曲线.计算了CH3I分子的吸收谱,分析了CH3I分子的光解离过程,并估计了激发态碘原子2I30/*2的量子产额.计算结果表明,该方法可用以解释光解离实验结果.
The effective potential energy curves correlated to 2I0 3/2 and 2I ^0 1/2^* atom limits are calculated using second order spin-obit multiconfigurational quasidegenerate perturbation theory (SO-MCQDPT). The absorption spectra of CH3I molecule are calculated, photodissociation processes of CH3 1 molecule are analyzed and the quantum yields of 2I^01/2 ^* atom are estimated. The present calculations can be used to interpret the experimental results.