期刊
CHEMICAL PHYSICS LETTERS
卷 372, 期 3-4, 页码 362-367出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0009-2614(03)00435-4
关键词
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It is shown that the coupled-cluster T-1 operator used in a previous study to define the open-shell D-1 diagnostic is ill defined, and leads to an arbitrary definition of the open-shell D-1 diagnostic. A new definition is proposed that eliminates this ambiguity and approximately restores the mathematical relationship previously noted between the closed-shell D-1 and T-1 diagnostics. Statistical comparison of the T-1 and D-1 diagnostics shows a very high degree of correlation between them for the molecular systems studied thus far, although it is argued that both diagnostics used together can provide more information than either can separately. Published by Elsevier Science B.V.
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