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An optimal point-charge model for molecular electrostatic potentials 

Authors: Andrew C. Simmonett a;  Andrew T. B. Gilbert b; Peter M. W. Gill b
Affiliations:   a School of Chemistry, University of Nottingham, Nottingham, NG7 2RD, UK
b Research School of Chemistry, Australian National University, ACT 0200, Australia
DOI: 10.1080/00268970500187910
Publication Frequency: 24 issues per year
Published in: journal Molecular Physics, Volume 103, Issue 20 October 2005 , pages 2789 - 2793
Number of References: 14
Formats available: HTML (English) : PDF (English)
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Abstract

Motivated by the Legendre expansion of the electrostatic potential (ESP), we propose a method for obtaining atomic point-charges for a molecule based on reproducing the low-order multipole moments of the system. The resulting multipole-derived charges (MDCs) are well defined, do not require sampling of the ESP at grid points around the molecule and provide excellent reproduction of the electrostatic potential. No constraints are placed on the magnitude of the atomic charges.
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