Calculation of self-consistent-field-Xαwave functions. Core-exchange polarization calculation for free atoms

Abstract
Core-exchange polarization (CEP) effects in free atoms have been calculated for 15 different atomic configurations of Li, Be, B, C, N, O, F, Na, Cl, K, Rb, and Cs using the self-consistent-field-Xα wave functions. Comparison with other results from the unrestricted Hartree-Fock (UHF) calculations and with experiments revealed that the Xα approximation does not reproduce well the CEP effects for each s orbital, but it presents rather a good value for the total CEP effect.