Europhys. Lett.
Volume 63, Number 3, August 2003
Page(s) 381 - 387
Section Condensed matter: structure, mechanical and thermal properties
Published online 01 November 2003
DOI: 10.1209/epl/i2003-00464-8
Europhys. Lett., 63 (3) , pp. 381-387 (2003)

Local dielectric permittivity near an interface

V. Ballenegger and J.-P. Hansen

Department of Chemistry, University of Cambridge - Cambridge CB2 1EW, UK

(Received 21 March 2003; accepted in final form 4 June 2003)

A statistical mechanics expression is derived for the space-dependent dielectric permittivity of a polar solvent near an interface. The asymptotic behaviour of this local permittivity is calculated in the low-density limit, near a planar interface. The potential of mean force between two ions is shown to agree with the prediction of macroscopic electrostatics for large separations parallel to the interface.

61.20.Gy - Theory and models of liquid structure.
77.22.Ch - Permittivity (dielectric function).

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