Abstract
A quantal resonance formalism is applied to the calculation of the cross sections for the absorption of photons of energies 26.9 and 30.5 eV into a 1Σ+u resonance Rydberg state of H2. The 1Σ+u state undergoes autoionization into the vibrational continuum of the 2Σ+g state of H+2, producing energetic H+ ions. The calculations reproduce state of H+2, producing energetic H+ ions. The calculations reproduce the maxima in the measured cross sections at H+ energies near 3.2 eV for overestimate the cross sections below 2.5 eV. An arbitrary reduction in the autoionizing widths by a factor of 2 restores agreement over the measured energy range, though more elaborate calculations of the widths suggest that values should be increased.
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