期刊
CHEMICAL PHYSICS LETTERS
卷 395, 期 4-6, 页码 227-232出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2004.07.081
关键词
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Complete-active-space self-consistent-field (CASSCF) orbitals are computationally expensive and are sometimes difficult to converge. We assess complete-active-space configuration interaction (CASCI) in a basis of natural orbitals as a less expensive alternative to CASSCF. Natural orbitals are generated from various single-reference wavefunctions. The approach is applied to bond breaking in methyl fluoride and ethylene. With natural orbitals from correlated wavefunctions, CASCI parallels CASSCF potential curves, and coupled-cluster singles and doubles natural orbitals give nonparallelity errors of only 1-3 kcal mol(-1) even for a very large active space in methyl fluoride or double bond breaking in ethylene. (C) 2004 Published by Elsevier B.V.
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