M-X-ray production cross sections of heavy elements by charged-particle impact

Abstract

The M-subshell ionization cross sections of heavy elements by proton and helium-ion impact have been calculated in the binary-encounter approximation. The momentum distribution of target electrons is taken into account by the use of the nonrelativistic and relativistic hydrogenic models and the Hartree–Fock–Roothaan method. The obtained subshell ionization cross sections are converted into the M-X-ray production cross sections and compared with experimental data and other theoretical calculations. The electronic relativistic effect and the wave-function effect on M-shell ionization cross sections are studied and possible reasons for large discrepancy between theory and experiment for Mγ-X-ray production cross section are discussed.