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oyezzy

铁虫 (小有名气)

[求助] sublevel和substate概念解释

Singlet fission is spin-allowed in the sense that the two resulting triplet excitations produced from an excited
singlet are born coupled into a pure singlet state.

In the absence of any interaction between the two triplets, the singlet 1(TT), triplet 3(TT), and quintet 5(TT)
states that result from the nine substates originating in the three sublevels of each triplet would have the same
energy.
上边是在关于singlet fission的综述中的一段话,1,3,5是左上角标。
其中的substate和sublevel的概念如何理解?与什么物理图像对应?
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