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London dispersion forces without density distortion: a path to first principles inclusion in density functional theory

Abstract

We analyse a path to construct density functionals for the dispersion interaction energy from an expression in terms of the ground state densities and exchange-correlation holes of the isolated fragments. The expression is based on a constrained search formalism for a supramolecular wavefunction that is forced to leave the diagonal of the many-body density matrix of each fragment unchanged, and is exact for the interaction between one-electron densities. We discuss several aspects: the needed features a density functional approximation for the exchange-correlation holes of the monomers should have, the optimal choice of the one-electron basis needed (named "dispersals"), and the functional derivative with respect to monomer density variations.

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Article information


Accepted
09 Jun 2020
First published
09 Jun 2020

Faraday Discuss., 2020, Accepted Manuscript
Article type
Paper

London dispersion forces without density distortion: a path to first principles inclusion in density functional theory

D. P. Kooi and P. Gori-Giorgi, Faraday Discuss., 2020, Accepted Manuscript , DOI: 10.1039/D0FD00056F

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