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We report a calculation of the Sternheimer anti-shielding factor, \gamma, bymeans of first order perturbation theory. In quality of basis functions, we useHartree-Fock electronic orbitals, expanded on hydrogenic atomic states. Thecomputed \gamma(r) for Fe^{3+} and Cu^{1+} inner electronic cores are reportedand compared with literature values, obtained from alternative methodologies.

Perturbative calculation of the Sternheimer anti-shielding factor with Hartree-Fock atomic orbitals