期刊
JOURNAL OF CHEMICAL PHYSICS
卷 152, 期 1, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5140669
关键词
-
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Universite Paul Sabatier (Toulouse, France)
The Delta NO method for static correlation is combined with second-order MOller-Plesset perturbation theory (MP2) and coupled-cluster singles and doubles (CCSD) to account for dynamic correlation. The MP2 and CCSD expressions are adapted from finite-temperature CCSD, which includes orbital occupancies and vacancies, and expanded orbital summations. Correlation is partitioned with the aid of damping factors incorporated into the MP2 and CCSD residual equations. Potential energy curves for a selection of diatomics are in good agreement with extrapolated full configuration interaction results and on par with conventional multireference approaches.
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