Abstract
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.
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Amusia, M.Y., Krivec, R., Mandelzweig, V.B. (2003). Two-Electron Photoionization Cross Sections at High Energies. In: Krivec, R., Rosina, M., Golli, B., Širca, S. (eds) Few-Body Problems in Physics ’02. Few-Body Systems, vol 14. Springer, Vienna. https://doi.org/10.1007/978-3-7091-6728-1_36
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DOI: https://doi.org/10.1007/978-3-7091-6728-1_36
Publisher Name: Springer, Vienna
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