COMPARISON OF THE SPHERICALLY AVERAGED PSEUDOPOTENTIAL MODEL WITH THESTABILIZED JELLIUM MODEL

We compare Kohn-Sham results (density, cohesive energy, size and effec t of charging) of the spherically averaged pseudopotential model with the stabilized jellium model for clusters of sodium and aluminium with less than 20 atoms. We find that the stabilized jellium model, althou gh conceptually and practically simpler, gives better results for the cohesive energy and the elastic stiffness. We use the local density ap proximation as well as the generalized gradient approximation for the exchange and correlation energies.