SURFACE AND INTERIOR ANION SOLVATION IN WATER CLUSTERS

We describe the cluster size dependence of the vertical electrostatic stabilization energies E(STAB)(n) of mass-selected I-(H2O)(n) (n = 7-6 0) clusters in terms of classical electrostatic solvation models for i nterior solvation, solvation inside the cluster surface and solvation on the cluster surface. Surface anion solvation in clusters of polar a nd polarizable molecules yields higher vertical electron detachment en ergies than those for internal anion solvation. The experimental resul ts for E(S)TAB(n) fit somewhat better the model of anion surface solva tion and extrapolate well to a value of E(STAB)(infinity) for solvatio n inside the surface.