No abstract

Intensities and energies of gold L&, LP, and Lp composite x-ray peaks have been measured with a Si(Li) detector as a function of proton bombarding energies from 0. 5-3.0 MeV. The ratios of Ln/Lp and Lo'/Ly peaks reach a maximum value at E&=1 Mev. An upward shift in the energy of the Lp peak of~100 eV was observed at E& --0. 5 MeV. Both effects (shifts and ratios) are due, at least in part, to the energy dependence of the L-subshell hole-production cross sections. The experimental results for the intensity ratios are in better agreement with theory if relativistic I -shell wave functions are used in the plane-wave Born-approximation calculations for L-subshell hole production.The inclusion of relativistic wave functions in the plane-wave Born-approximation (PWBA) calculations of inner-shell ionization cross sections

Experimental ratios of L-subshell cross sections are given for ionization of lead and bismuth by 0.5-4-MeV-proton bombardment. The ratio of the L " to L1 cross sections exhibits a maximum near 1.75 MeV. Individual subshell cross sections are obtained from the experimental ratios and previous total-cross-section data. These subshell ratios and cross sections are compared with the theoretical predictions of the plane-wave Born approximation using nonrelativistic hydrogenic wave functions, of the binary-encounter approximation sided from Mg K-shell cross sections, and of the binary-encounter approximation scaled from cross sections obtained using L-shell velocity distributions. It was found that both approximations predict the trend of the data for the L«and L,» subshells, but that only the plane-wave Born approximation gave the proper behavior for the L, subshell.