A self-consistent approximation to the Kohn-Sham exchange potential.

O.V. Gritsenko, R. van Leeuwen, E. van Lenthe, E.J. Baerends

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A scheme of approximation of the Kohn-Sham exchange potential vx is proposed, making use of a partitioning of vx into the long-range Slater vS and the short-range response vresp components. A model potential vrespmod has been derived from dimensional arguments. It possesses the proper short-range behavior and the atomic-shell stepped structure characteristic for vresp. When combined with the accurate vS, vrespmod provides an excellent approximation to the exchange potential of the optimized potential model vxOPM. With the generalized-gradient approximation to vS vrespmod provides an efficient density-functional-theory approach that fits closely the form of the accurate exchange potential and yields reasonably accurate exchange and total energies as well as the energy of the highest occupied orbital. © 1995 The American Physical Society.
Original languageEnglish
Pages (from-to)1944-1954
JournalPhysical Review A. Atomic, Molecular and Optical Physics
Publication statusPublished - 1995


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