Configuration interaction with singles and doubles

CISD configuration interaction with single and double excitations... 

Configuration Interaction by Perturbation with Multiconfigurational Zero-Order Wave Function Selected by Iterative Process Configuration Interaction with Singles and Doubles Density Functional Theory Effective Core Potential Generalized Gradient Approximation Hartree-Fock... 

Quadratic Configuration Interaction with Singles and Doubles Quadratic Configuration Interaction with Singles, Doubles, and Noniterative Approximation of Triples Symmetry Adapted Cluster-Configuration Interaction Split-Valence basis set plus Polarisation functions Zero-Order Regular Approximation Zero-Point Energy... 

The total symmetry of the molecule is D2h, so we cannot have point group degenerate states. The accidentally degenerate states represented above have C2v symmetry. The direct product C2v Cs recovers properly the full symmetry of the system. Depending on the particular excitation and final spin state four states can be generated. In Table 4 we compare the results of Hartree-Fock (HF), configuration interaction with singles and doubles excitations (CI-SD) and the two structure GMS calculations, with the available experimental data. 

CISD Configuration interaction with singles and doubles... 

Zero-Order Wave Function Selected by Iterative Process CISD Configuration Interaction with Singles and Doubles... 

As has been demonstrated by numerous studies, the accuracy of properties calculated using the GGA DFT methods is, in most cases, comparable to or better than those from ab initio MP2 (Mpller-Plesset second-order perturbation) or CISD (configuration interaction with single and double excitations) methods. In fact, the accuracy of the DFT results in some instances matches those obtained from the much more costly (but, in principle, more exact) CCSD(T) (coupled cluster singles and doubles with a perturbative inclusion of connected triple excitations) method (29) and the ab initio G1 procedure (30). 

Yang, X. and Boggs, J.E. (2005) Ground and valence-excited states of SF a multireference configuration interaction with single and double excitationsH-Q study. 

The high bond stabilities in LaAu and LuAu have been studied by Schwerdtfeger and Dolg (1991) using relativistic as well as nonrelativistic ab initio PPs and correlation treatments like Moller-Plesset perturbation theory up to fourth order (MP , = 2,3,4), configuration interaction with single and double substitutions (CISD) and coupled electron... 

The calculations were performed with several different levels of correlation treatment Hartree-Fock (HF), configuration interaction with single and double excitations (SDCI), Multiconfiguration self consistent field (CAS), and multireference configuration interaction (MRCI). Relativistic efferts were accounted for using either the Douglas-Kroll method or a relativistic effective core potential approach (RECP). 

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