Two-Electron Photoionization Cross Sections at High Energies
Double and single electron photoionization cross sections and their ratios at high and ultra-relativistic energies are calculated for H−, He and helium-like ions in ground and excited states including triplet states. The ratios contain shake-off and quasi-free terms. A high precision non-variational wave function is used. The quasi-free mechanism increases the ratios impressively: for He we get 0.0762 instead of 0.0164 in the non-relativistic case. Ratios are inversely proportional to Z 2, with a factor increasing from 0.094 in the non-relativistic to 0.595 in the ultra-relativistic limit.
KeywordsPhotoionization Cross Section Final State Interaction Isoelectronic Sequence Ground State Correlation Excited Initial State
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