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zgj5251214

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[交流] 哪位知道kasha规则吗?

一些文献里这样描述kasha规则:
The emitting electronic level of a given multiplicity is the lowest excited level of that multiplicity.
From a symmetrical consideration,the excited states are classified into Ag and Bu symmetries in the centrosymmetric one-dimensional pai-conjugated system. Since the ground state has the Ag symmetry,only Bu excited states can be optically allowed (i.e. one-photon electric-dipole allowed).
哪位大侠解释一下或者奉献点这方面的资料,怎么样区分激发态是Ag还是Bu?文献里说如果Ag激发态的能量高于Bu的,则能发光,否则不能发光。这里激发态Ag,Bu的能量指的是什么?谢谢
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