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Some comments and corrections regarding the calculation of electrostatic potential derivatives using the Ewald summation technique
Authors:Stenhammar Joakim  Trulsson Martin  Linse Per
Institution:Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden. joakim.stenhammar@fkem1.lu.se
Abstract:A review of the literature on the calculation of electrostatic potentials, fields, and field gradients in systems consisting of charges and dipoles using the Ewald summation technique is presented. Discrepancies between the previous formulas are highlighted, and an error in the derivation of the reciprocal contributions to the electrostatic field and field gradient is corrected. The new formulas for the field and field gradient are shown to exhibit a termwise identity with the ones for the electrostatic energy.
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