A model for the surface of molten salt. II. Electroneutrality and parameter changes

The Fowler model for an interface, which assumes two-particle distribution functions to be those of bulk liquid whenever both particles are on the liquid side of a geometric dividing surface and zero otherwise, gives ridiculous results for a molten salt. A correction to ensure local electroneutrality, demanded by the Coulombic forces, re-establishes qualitative agreement with reality. Equations for the electroneutrality correction (previously made only approximately) are given and solved by a variational technique. A simplified route to the bulk liquid distribution functions is developed; this permits experimentation with changes in parameters in the reduced primitive model used for the molten salt. The effect of such changes on calculated surface properties is investigated, and further improvements in the model discussed.