Titlebook: Many-Body Methods in Quantum Chemistry; Proceedings of the S U. Kaldor Conference proceedings 1989 Springer-Verlag Berlin Heidelberg 1989 C

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Multi-Reference-State Rayleigh-Schr?dinger Perturbation Theorysis is towards flexibility and expansibility of the reference space in order to improve correlationenergy calculations. The problem of intruder states is averted on moving to a non-diagrammatic representation of the perturbation series. This approach is particularly suitable for the evaluation of po

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Some Consideration of Alternative Ans?tz in Coupled-Cluster Theory perturbation truncation followed by a series of order dependent cancellations, some new types of size-extensive approximations are considered. One principal result is that a new type of factorization for all effects of T. through fifth-order in the correlation correction may be obtained by only an

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Spin-Adapted Multi-Reference Coupled Cluster Formalism Including Non-Linear Terms and its Applicationg closed-shell-type configurations [B. Jeziorski and J. Paldus, J. Chem. Phys. ., 5673 (1988)] has been extended by including quadratic terms in both the direct and the coupling part of the MRCC equations. The formalism has been applied to the H. model system studied earlier by Jankowski and Paldus

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Quadratic Configuration Interaction Method: Recent Applications and Comparison with Other Correlatiooupled cluster methods. The nature of the configuration expansion coefficients which result from a solution of the QCI equations is discussed. Different correlation methods are compared by performing a perturbation expansion of the correlation energy up to fifth order. Finally, the range of applicab