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The question of how density functional theory (DFT) compares withHartree-Fock (HF) for the computation of momentum-space properties is addressedin relation to systems for which (near) exact Kohn-Sham (KS) and HFone-electron matrices are known. This makes it possible to objectively compareHF and exact KS and hence to assess the potential of DFT for momentum spacestudies. The systems considered are the Moshinsky atom, the Hooke's atom andlight two-electron ions, for which expressions for correlated density-matricesor momentum densities have been derived in closed-form. The results obtainedshow that it is necessary to make a distinction between true and approximateDFT.Comment: 30 pages, accepted for publication in J. Chem. Phys. (2006

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