M shell ionization of Ar induced in near-central collisions with MeV protons

摘要

High energy resolution K beta(1,3) x-ray emission spectra of Ar induced in collisions with 0.75-3.0 MeV protons were measured using a complete in-vacuum curved-crystal x-ray emission spectrometer in Johansson geometry. The K beta M-1,3(1,2) satellite lines were clearly resolved in the measured spectra and their intensity relative to the parent K beta(1,3) diagram line was used to extract the M shell single ionization probability for near-central collisions. The experimental values are compared to the theoretical predictions calculated within the semiclassical approximation ( SCA) and also the binary encounter based geometrical model. Very good agreement with experimental data was achieved for the SCA values employing concise Dirac-Hartree-Fock wave functions for the description of valence M shell electrons.