Experimental L-series x ray production cross sections for Re by tuning synchrotron radiation across its Li (i=1–3) sub-shell ionization thresholds

Abstract In the present work, the Lk (k = l, α, η, β1, β3, β6, β4, β2,15, β5,7, β9,10, γ1,5, γ2,3,6,8, γ4) x ray production (XRP) cross sections have been measured for Re at energies across its Li (i = 1–3) sub-shell ionization threshold energies covering the region 10.5 keV–14.0 keV using synchrotron radiation. The measured values have been compared with the three sets of XRP cross sections calculated using the Dirac-Fock model based x ray emission rates, the non-relativistic Hartree-Fock-Slater model based Li (i = 1–3) sub-shell photoionization cross-sections and three sets of the fluorescence (ωi) and Coster-Kronig (fij) yields based on the Dirac-Hartree-Slater model based values, the semi-empirical values and the experimental values reported earlier by us. The present measured XRP cross sections are found to be in a good agreement with those calculated using the experimental ωi/fij values; whereas these are found to be significantly lower (~30%) than those calculated using the theoretical and the semi-empirical ωi/fij values. In view of the observed good agreement of the present measured Lk XRP cross sections with those calculated using the experimental fluorescence and Coster-Kronig yields and that of the measured branching ratios (ILl/ILα,; ILβ2,15/ILα,; ILη/ILβ1; ILγ1,5/ILβ1 and ILγ2,3/ILβ3) with the theoretical values calculated using the Dirac-Fock model based x ray emission rates, the use of these parameters is recommended for different analytical applications.