Ionization of two-electron systems by Compton scattering of a photon

Abstract

Photoionization of two-electron systems is studied. The nonrelativistic impulse approximation is applied to treat the Compton ionization contributions. For asymptotically high energies this treatment formally reduces to the generalized shake theory and predicts a limit for the ratio of double to single ionization different from that for photoeffect. At finite energies the ratio for He, which includes both Compton and photoeffect contributions, is marginally in agreement with experimental results but it disagrees with previous theoretical calculations.