Abstract
Measurements of L-shell x-rays and Rutherford backscattering in some rare-earth elements produced by 2 MeV ions were used to study the dependence of individual L-subshell ionization cross sections on atomic number. The results were compared with the theoretical predictions of the ECPSSR theory. The discrepancies observed were reduced but not completely overcome by the inclusion of modifications to the theory, known as ECPSSR-IS and ECPSSR-IS-UA, which favour vacancy transfer from the -subshell to the - and -subshells. The theoretical models used for the comparison with experiment could successfully predict the functional dependence of -subshell ionization cross section on atomic number, but not the functional parameters.
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