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Article Dans Une Revue Journal of Chemical Physics Année : 2006

Exact Kohn-Sham versus Hartree-Fock in momentum space: Examples of two-fermion systems

Résumé

The question of how density functional theory (DFT) compares with Hartree-Fock (HF) for the computation of momentum-space properties is addressed in relation to systems for which (near) exact Kohn-Sham (KS) and HF one-electron matrices are known. This makes it possible to objectively compare HF and exact KS and hence to assess the potential of DFT for momentum-space studies. The systems considered are the Moshinsky [Am. J. Phys. 36, 52 (1968)] atom, Hooke's atom, and light two-electron ions, for which expressions for correlated density matrices or momentum densities have been derived in closed form. The results obtained show that it is necessary to make a distinction between true and approximate DFTs. (c) 2006 American Institute of Physics.

Dates et versions

hal-00116324 , version 1 (25-11-2006)

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Citer

Sebastien Ragot. Exact Kohn-Sham versus Hartree-Fock in momentum space: Examples of two-fermion systems. Journal of Chemical Physics, 2006, 125, pp.Art. No. 014106. ⟨10.1063/1.2212935⟩. ⟨hal-00116324⟩
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