期刊
ACCOUNTS OF CHEMICAL RESEARCH
卷 39, 期 2, 页码 83-91出版社
AMER CHEMICAL SOC
DOI: 10.1021/ar0402006
关键词
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The spin-flip (SF) approach to multireference situations (e.g., bond breaking, diradicals, and triradicals) is described. Both closed- and open-shell low-spin states are described within a single reference formalism as spin-flipping, e.g., alpha -> beta, excitations from a high-spin reference state for which both dynamical and nondynamical correlation effects are much smaller than for the corresponding low-spin state. Formally, the SF approach can be viewed as an equation-of-motion model, where target states are sought on the basis of determinants conserving the total number of electrons but changing the number of alpha and beta electrons.
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