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Orbital Hartree-Fock and the local spin density approximations to exchange are compared. The self-exchange intergrals calculated from the Hartree-Fock approximation are far larger than those calculated from the local spin density approximation. We suggest that, in metals where the exchange integrals are well shielded, a suitable functional for exchange may be obtained by scaling the orbital Hartree-Fock approximation to the local spin density approximation while retaining the stronger orbital dependence. Application to Fe and US produces good agreement with measurements.
Severin et al. (Mon,) studied this question.