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We report calculations for exclusive ionization-excitation Compton cross sections, both total and differential in energy transfer, for n = 3-5 of the negative hydrogen ion and the helium atom. We find that, unlike the cross section for n = 1 and 2, the exclusive cross sections for n 3 are not very sensitive to atomic parameters such as geometric size and electron correlation. We discuss differences and similarities of the cross sections when different initial-state wavefunctions are used, and compare with the Compton cross section for collision of a photon with a free electron. Our calculations have been carried out for photon energies from 6 to 60 keV.

Ionization-excitation of H-and He by Compton scattering

Ionization-excitation of H^-and He by Compton scattering