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Optimal virtual orbitals to relax wave functions built up with transferred extremely localized molecular orbitals

机译:最佳虚拟轨道,以放松由转移的极局限分子轨道建立的波函数

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摘要

Extremely localized molecular orbitals (ELMOs), namely orbitals strictly localized on molecular fragments, are easily transferable from one molecule to another one. Hence, they provide a natural way to set up the electronic structure of large molecules using a data base of orbitals obtained from model molecules. However, this procedure obviously increases the energy with respect to a traditional MO calculation. To gain accuracy, it is important to introduce a partial electron delocalization. This can be carried out by defining proper optimal virtual orbitals that supply an efficient set for nonorthogonal configurations to be employed in VB-like expansions. (c) 2005 Wiley Periodicals, Inc.
机译:极局限的分子轨道(ELMO),即严格位于分子片段上的轨道,很容易从一个分子转移到另一个。因此,它们提供了使用从模型分子获得的轨道数据库来建立大分子电子结构的自然方法。但是,相对于传统的MO计算,此过程显然会增加能量。为了获得准确性,引入部分电子离域很重要。这可以通过定义适当的最佳虚拟轨道来实现,这些轨道为VB类扩展中采用的非正交配置提供了有效的集合。 (c)2005年Wiley Periodicals,Inc.

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