Abstract
The cross sections for double and single photoexcitation and -ionization of helium are calculated in the acceleration gauge assuming a totally asymmetric energy and angular momentum partitioning between two electrons. The electron-electron correlation is taken into account in the ground-state wave function. By extrapolating single-ionization differential oscillator strengths to [ital n][r arrow][infinity], where [ital n] is the excited He[sup +] principal quantum number, an estimate of the double-ionization cross sections is obtained. Comparison with other calculations is made.
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“Photoexcitation and -Ionization in Helium: Zero-Kinetic-Energy Spectroscopy.” Physical Review A 50 (4): 3174–76
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