Kα x-ray satellite lines of Si induced in collisions with 1-3-MeV protons

The Kα x-ray emission spectra of Si bombarded by 1-3-MeV protons were measured with a crystal spectrometer in Johansson geometry, enabling energy resolution below the natural linewidth of the measured Kα line. The KαL1 and KαL2 (KαL1,2) x-ray satellite lines appearing in these spectra as a result of the radiative decay of atomic states with one hole in the K shell and one or two in the L subshells were precisely measured. The energies and intensities of the main components that could be resolved within the satellite lines are given. It has been demonstrated that the latter do not depend on proton energy and are essentially the same as in photon-induced spectra. The overall KαL1 satellite intensity relative to the Kα diagram line has been used to deduce the L-shell ionization probabilities induced in near-central proton collisions. The experimental values were compared to the theoretical values calculated with the semiclassical approximation, with the three-body classical trajectory Monte Carlo model, and the classical binary-encounter-based geometrical model