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[求助] 求助多个单电子的算法

大家有没有计算过这种体系:四个单电子两两耦合,表现出单线态的形式。现想通过理论计算看出四个单电子的分布。查到一篇类似的文献A depiction of the electronic structures of 1 and 2 was derived from broken symmetry density functional theoretical (BS DFT) calculations using BP86 and B3LYP functionals. Both molecules were truncated with the isopropyl groups replaced by hydrogens to decrease computation time. The geometry of the neutral species in 1 was
calculated spin-unrestricted using BS(3,3) with the B3LYP functional.用到了BS(3,3) 就是体系显示为单线态,但是是6个单电子两两耦合。这种的体系如何计算,关键词是什么?
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