Abstract
Measurements have been made of the L X-ray emission from thin targets of Dy, Yb, W, Au, Pb, Bi, Ti and U bombarded by protons of energy 1-3 MeV. From these measurements the L-subshell ionisation cross sections have been determined and compared with the predictions of the CEPSSR theory. The ratios of the experimental to theoretical cross sections are presented as a function of the corrected, reduced proton velocity parameter, xi LiR. Significant discrepancies occur for the L1 and L2 subshells for xi LiR<0.7, and the L2-subshell cross sections are underpredicted by the theory for all elements studied. Possible reasons for the observed discrepancies are discussed. The atomic number dependence of the experimental L subshell and total cross sections is presented for 2 MeV incident protons.
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