Atomic photoeffect cross sections by non-relativistic Dirac–Hartree–Slater

(DHS) calculations were based on Scofield’s solution of the Dirac equation for the orbital

electrons moving in a static Hartree–Slater (HS) central potential. In the Hartree–Slater (HS)

approximation (Slater 1951) the electron–electron interaction term is replaced with its average

radial value. Hence the HS model is somewhat less accurate than the full Hartree–Fock (HF)

model which requires calculation of the self-consistent field for each term in the Slater product

and is thus much more costly than HS in computer time.