Effects of exchange, electron correlation, and relaxation on theL1−L23M1Coster-Kronig spectrum of argon

A relaxed-orbital multiconfiguration Hartree-Fock calculation of the $L_1-L_{23}{M}_1$ Coster-Kronig transitions in Ar has been performed. The effects of exchange between the continuum electron and the bound-state electrons have been examined. With regard to transition energies, excellent agreement with experiment is attained. Calculated transition probabilities are slightly closer to measured rates than in previous theoretical work that does not include complete relaxation, but an important discrepancy still remains that apparently cannot be resolved within the independent-particle framework.