The SS(V)PE method provides a simple and efficient dielectric continuum model of the electrostatic effects of solvation on the properties of a calculated solute molecule.

Unique aspects of the method include:

  1. a smooth isodensity description of the solute cavity, as opposed to the commonplace union of atomic spheres cavity; and
  2. an accurate treatment of the influence of solute electron density that quantum mechanically penetrates outside the cavity that nominally encloses it, which is particularly important for charged solutes, and for second- and higher-order properties even in neutral olutes.

A useful account of the method can be found in:
"Comparison of solvent reaction field representations"
D. M. Chipman, Theor. Chem. Acc. 107, 80-89 (2002).