CORRELATION POTENTIALS AND FUNCTIONALS IN HARTREE-FOCK-KOHN-SHAM THEORY

We compute molecular Hartree-Fock-Kohn-Sham correlation potentials fro m nb initio coupled-cluster densities via a modified Zhao, Morrison an d Parr [Phys. Rev. A, 50, (1994) 2138] scheme involving exact exchange . We examine the potential for several small systems, and observe comp lex structure. By fitting a functional expansion to our potentials we obtain a closed-shell functional which is an improvement over other pu re correlation functionals in Hartree-Fock-Kohn-Sham calculations. The leading term in our functional is dependent on the number of electron s. Our results lead us to question the utility of correlation defined within the Hartree-Fock-Kohn-Sham scheme, and to consider alternative partitionings of the exchange-correlation energy. (C) 1997 American In stitute of Physics.