Abstract
Two-photon above-threshold ionization cross sections and angular distributions have been calculated for Mg in the region between the $3p$ and $4s$ ionization thresholds. We have used the Green's function method in the Feshbach formalism and an ${L}^{2}$ close coupling method, with a basis of ${L}^{2}$ integrable B-spline functions. We report the positions, widths, and assignments of a number of ${}^{1}{S}^{e}$ and ${}^{1}{D}^{e}$ doubly excited Feshbach states. We have found that correlation is important in the Feshbach states, indicated by significant mixing among configurations, and identified a previously unnoticed $``3d5g''$ Feshbach state.
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