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Long-range configuration interaction with an ab initio short-range correction and an asymptotic lower bound

Year: 2024
Type: preprint
Abstract: Short-range corrections to long-range selected configuration interaction calculations are derived from perturbation theory considerations and applied to harmonium (with two to six electrons for some low-lying states). No fitting to reference data is used, and the method is applicable to ground and excited states. The formulas derived are rigorous when the physical interaction is approached. In this regime, the second-order expression provides a lower bound to the long-range full configuration interaction energy. A long-range/short-range separation of the interaction between electrons at a distance of the order of one atomic unit provides total energies within chemical accuracy, and, for the systems studied, provide better results than short-range density functional approximations.
DOI: 10.48550/arxiv.2407.09151
Institutions: Centre National de la Recherche Scientifique, Université Toulouse III - Paul Sabatier, Sorbonne Université, Laboratoire de Chimie Théorique, Laboratoire de Chimie et Physique Quantiques, Université de Toulouse
Language: English
Open Access status: green
OpenAlex ID: W6966993202
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