【摘 要】
：
利用SAC/SAC-CI方法,使用D95(d)、 6-311G* *及cc-PVTZ等基组,对LiH分子的基态(X 1Σ+)、第一激发态(A 1Σ+)及第二简并激发态(B 1Π)的平衡结构和谐振频率进行了优化计算.通
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利用SAC/SAC-CI方法,使用D95(d)、 6-311G* *及cc-PVTZ等基组,对LiH分子的基态(X 1Σ+)、第一激发态(A 1Σ+)及第二简并激发态(B 1Π)的平衡结构和谐振频率进行了优化计算.通过对三个基组的计算结果的比较,得出了D95(d)基组为三个基组中的最优基组的结论;使用D95(d)基组,利用SAC的GSUM(Group Sum of Operators)方法对基态(X 1Σ+)、 SAC-CI的GSUM方法对激发态(A 1Σ+和B 1Π)进行单点能扫描计算,用正规方程组拟合Murrell-Sorbie函数,得到了相应电子态的完整势能函数;从得到的势能函数计算了与基态(X 1Σ+)相对应的光谱常数,结果与实验数据较为一致.
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