K-shell x-ray production cross sections for low-Z elements (11

Abstract

K-shell x-ray production cross sections for Na, Mg, Al, Si, Cl, K, Ca, and Ti bombarded by $^{4}\mathrm{He}^{+}$ ions in the energy range 1.0--2.5 MeV have been measured using thin targets. The ionization cross sections deduced are compared with various Coulomb-ionization theories based on the plane-wave Born approximation, the binary-encounter approximation, and the simplified semiclassical approximation according to the Andersen, L/gsgaard, and Lund [Nucl. Instrum. Methods 192, 79 (1982)] and 1s\ensuremath{\sigma} molecular-orbital ionization theory. The calculations based on a perturbed-stationary-state approach including all the corrections such as the Coulomb deflection, the increased binding energy, and the relativistic effects, describe the data best although there are deviations in the case of Na at lower energies.