The photoionization cross section of magnesium near threshold

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Abstract
The photoionization cross section of magnesium was calculated from 0 to approximately 4 eV (0.15 au) above the first ionization threshold in both the dipole-length and dipole-velocity formulations. The method of configuration interaction was used with explicit inclusion of autoionizing and continuum configurations. As expected, the cross section is dominated by autoionization from the 3pns and 3pnd series. The widths of the 3pns lines are on the order of a few tenths of an eV or less, which is about one-half their separation. The widths of the 3pnd lines are on the order of one hundred times less than those of the 3pns series. The positions of the autoionizing levels as determined from the phase shift, agree extremely well with close-coupling calculations and quite well with experimental results. The overall shape of the cross section as determined in the dipole-velocity formulation compares favourably with experiment. The energies of the 3sns(1S), n=3 to 9, series were found from the eigenvalues of the 47 configuration ground state used and agree with other theoretical work and experiment. Also, the energies and multiplet strengths of the 3snp(1P), n=3 to 6, series were calculated.

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