Abstract
We report extensive calculations of energy positions, autoionization widths and branching ratios for the Q2 doubly excited states of H2 lying above the second ionization threshold 2Σu+. We present results for 60 doubly excited states of the 1,3Σg,u+, 1,3Πg,u, and 1,3Δg,u symmetries in the range of internuclear distances 0⩽R⩽6 a.u. The resonance parameters have been obtained using the Feshbach theory and an L2 representation of the nonresonant continuum with B-spline functions. Our results are compared with previous theoretical data. We have found significant discrepancies for states of the 1Σg+ and 1Σu+ symmetries.
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