Experimental evidence for onset of L1-L3M5 transition at Z=75 through measurements of fluorescence and Coster-Kronig yields for 74W and 75Re

In the present work, the experimental Li (i=1-3) sub-shell fluorescence (1, 2, 3) and Coster-Kronig (f12, f13, f23) yields for 74W and 75Re have been deduced from synchrotron radiation induced X-ray line intensities measured at different incident energies across Li absorption edge energies of both the elements employing two sets of photoionization cross sections based on the non-relativistic Hartree-Fock-Slater model and the self-consistent Dirac-Hartree-Fock model. These deduced yields have been compared with the Dirac-Hartree-Slater model based theoretical values, the semi-empirical values tabulated by Krause and the recommended values tabulated by Campbell. The present investigation provided a reliable experimental evidence indicating the onset of intense L1-L3M5 Coster-Kronig transition at Z=75.