  We have performed self-consistent calculations for first and second row atoms
using a variant of density-functional theory, the optimized effective potential
method, with an approximation due to Krieger, Li and Iafrate and a
correlation-energy functional developed by Colle and Salvetti. The mean
absolute deviation of first-row atomic ground-state energies from the exact
non-relativistic values is 4.7 mH in our scheme, as compared to 4.5 mH in a
recent configuration-interaction calculation. The proposed scheme is
significantly more accurate than the conventional Kohn-Sham method while the
numerical effort involved is about the same as for an ordinary Hartree-Fock
calculation.
