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[交流] [求助]电子光谱中的Singlet-A和Singlet-E含义

在计算一个为C3点群的分子,电子光谱中有这样的结果提示对称性为的Singlet-A,具体的含义是什么?

同时看到这样一段话
For the molecule having C3 point group, orbitals have two types of symmetries, ‘‘A’’ and ‘‘E’’ group, where especially the orbital belonging to ‘‘E’’ group has two eigenstates degenerated in energy. According to the characteristics of those symmetry, the electron distribution of HOMO
having ‘‘A’’ point group exists totally in all three ligands and those of HOMO-1 and HOMO-2 which have ‘‘E’’ point group dominantly exists in two ligands.

C3点群的分子、电子布局的点群和Singlet-A或Singlet-E之间有什么关系?
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