Experimental L-Series X Ray Production Cross Sections For Re By Tuning Synchrotron Radiation Across Its L-I (I=1-3) Sub-Shell Ionization Thresholds

In the present work, the L-k (k = l, alpha, eta, beta(1), beta(3), beta(6), beta(4), beta(2,15), beta(5,7), beta(9,10), gamma(1,5), gamma(2,3,6,8), gamma(4)) x ray production (XRP) cross sections have been measured for Re at energies across its L-i (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 L-i (i = 1-3) sub-shell photoionization cross-sections and three sets of the fluorescence (omega(i)) and Coster-Kronig (f(ij)) 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 omega(i)/f(ij) values; whereas these are found to be significantly lower (similar to 30%) than those calculated using the theoretical and the semiempirical omega(i)/f(ij) 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 (I-Ll/I-L alpha,; I-L beta 2,I-15/I-L alpha,; I-L eta/I-L beta 1; I-L gamma 1,I-5/I-L beta 1 and I-L gamma 2,I-3/I-L beta 3) 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.