L X-ray production cross sections of Au, Bi and U by protons of energy 0.3 to 1.8 MeV

Partial L X-ray production cross sections for proton bombardment of Au, Bi and U have been systematically measured in the energy range 0.3 to 1.8 MeV. This targets have been used in transmission geometry. For Bi and U, detailed low-energy measurements are reported here for the first time. Intensity ratios I_alpha /I_beta ,I_alpha /I_gamma and I_alpha /I_l have been as a function of proton energy. Data are compared with the theoretical predictions of the PWBA and the PWBA with Coulomb deflection and binding corrections. There are indications that inclusion of relativistic corrections in the PWBA substantially improves the agreement with experiment.