Abstract
Comparison between theoretical and experimental values for L-subshell ionization cross sections by low-energy protons and α particles has been made graphically. The theoretical values are calculated by the relativistic plane-wave Born approximation, including the corrections for the binding-energy and Coulomb-deflection effects. The experimental data are expressed as a ratio to the calculated values and plotted against a reduced velocity parameter. It is found that agreement between theory and experiment is not so good as in the case of the K-shell ionization cross sections. ForL1 and L3 shell, most experimental data are in agreement with the calculated values within errors of 60%. However, the measured values for L2 shell are systematically larger than the calculated ones. Possible reasons for the discrepancy are discussed.
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