Abstract
While substantial progress has been made in recent years in the methods and implementation of quantum chemical calculations, the results of such calculations still fall short, in many cases, of requirements. Generally, single-reference methods have difficulties in handling nondynamical correlation effects (which are due to near degeneracies of the reference function). The configuration interaction method easily deals with these effects by the use of multireference expansions, but has much greater difficulty than MBPT and coupled cluster methods in handling dynamical correlation because of its inability to treat disconnected cluster effects adequately. The most effective approach should combine a multiconfiguration reference function for the treatment of nondynamical correlation with a coupled cluster treatment (or a good approximation thereof) of dynamical correlation.
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Shavitt, I. (1984). The Treatment of Electron Correlation: Where do We Go from Here?. In: Dykstra, C.E. (eds) Advanced Theories and Computational Approaches to the Electronic Structure of Molecules. NATO ASI Series, vol 133. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6451-8_10
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