L-SUBSHELL IONIZATION STUDIES IN AU AND BI BY 4.8-8.8 MEV BORON ION-BOMBARDMENT

L-subshell ionization of Au and Bi induced by boron impact has been in vestigated for impact energies ranging from 4.8 to 8.8 MeV. The result s for all the three subshell ionization cross-sections show plateau li ke structure for the energy dependence which we feel can be attributed to plausible Stark mixing of target atomic 2s and 2p wave functions, Comparison of the data with the ECPSSR (perturbed stationary states (P SS) with projectile energy loss (E), Coulomb deflection (C) and relati vistic (R) correction for target electron motion) and semiclassical ap proximation (SCA) calculations shows significant deviations for L(1)- and L(2)-subshell ionization cross-sections, The experimental X-ray pr oduction cross-sections and their ratios with respect to Ln also show significant deviations from theory. Fresh calculations with more reali stic target atomic wave functions and improved binding energy correcti ons are necessary for bringing better agreement with the experimental data.