Nonadjustable local model potentials for the exchange interaction between valence and core electrons

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Abstract
The ability of existing nonadjustable local-exchange approximations to represent interelectronic exchange is tested by comparing valence-electron energies and average radii in Rb and Ag as determined in two different approaches: a relativistic-model-potential approach and one employing the polarizable frozen-core relativistic Hartree-Fock method. The calculations are identical in these two approaches except for the treatment of exchange. Two approximations originally developed for electron-atom-scattering processes are found to be the most accurate. A new approximation based on the free-electron-gas model is also discussed.