Photoionization cross-sections for all levels belonging to configurations 1si2si2ps3si3p , q > 0, of atoms and ions of aluminum, silicon, and argon have been calculated using Hartree-Fock bound-electron wave functions and close-coupling approximation free-electron wave functions. The results are presented in the form of a computationally convenient interpolation formula.
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Chapman et al. (1972) studied this question.