CONSISTENT DIELECTRIC-PROPERTIES OF THE SIMPLE POINT-CHARGE AND EXTENDED SIMPLE POINT-CHARGE WATER MODELS AT 277 AND 300 K

The dielectric constants (epsilon) of the simple point charge (SPC) an d extended simple point charge (SPC/E) models of liquid water have bee n determined at 277 and 300 K using a reaction field (epsilon(RF)) tre atment for the long-range electrostatic interaction. Consistent dielec tric constants are obtained by using statistical mechanical perturbati on theory, such that the properties of the system correspond to epsilo n(RF)=epsilon, and are therefore representative of a true infinite sys tem. The dielectric constants of SPC were determined to be 55.8 and 54 .0 at 277 and 300 K, respectively, while the dielectric constants of S PC/E were 68.5 and 62.3 at 277 and 300 K, respectively.