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Article: Recent findings from University of Florida, Quantum Theory Project highlight research in chemical physics.
- Article from:
- Physics Week
- Article date:
- September 8, 2009
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"Coupled-cluster singles and doubles (CCSD) or coupled-cluster singles, doubles, and triples (CCSDT) with noniterative, perturbation corrections for higher-order excitations have been extended to include the basis functions that explicitly depend on interelectronic distances (r(12)) in the wave function expansions with the aim of dramatically accelerating the basis-set convergence of correlation energies. The extension has been based on the so-called R12 (or F12) scheme and applied to a second-order triples correction to CCSD [CCSD(2)(T)-R12], a second-order triples and quadruples correction to CCSD [CCSD(2)(TQ)-R12], a third-order triples correction to CCSD ...
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