Abstract
Born-approximation calculations of the ionization of aluminum $L$-shell electrons have been performed using Hartree-Slater wave functions. Generalized oscillator strengths and proton energy-loss cross sections from threshold to ionized-electron energies of 128 Ry have been calculated. The results show a delayed maximum above threshold, and the ramifications of this phenomenon are discussed. Comparison is made with hydrogenic results and good agreement is found at intermediate and large energy loss, but the hydrogenic calculation is totally inadequate near threshold. The implications of this for stopping-power calculations and subshell corrections is discussed. The Bethe asymptotic cross section is obtained and the variation of parameters therein is investigated.
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