Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 137, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4751485
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Funding
- Office of Energy Research, Office of Basic Energy Sciences, Chemical Sciences Division of the U.S. Department of Energy [DE-AC0376SF00098]
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Closed-shell coupled cluster singles and doubles (CCSD) is among the most important of electronic-structure methods. However, it fails qualitatively when applied to molecular systems with more than two strongly correlated electrons, such as those with stretched or broken covalent bonds. We show that it is possible to modify the doubles amplitudes to obtain a closed-shell CCSD method that retains the computational cost and desirable features of standard closed-shell CCSD, e. g., correct spin symmetry, size extensivity, orbital invariance, etc., but produces greatly improved energies upon bond dissociation of multiple electron pairs; indeed, under certain conditions the dissociation energies are exact. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4751485]
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