Li(i=1–3) sub-shell x-ray relative intensities for some compounds of 66Dy at 22.6 and 59.54 keV incident photon energies

The intensity ratios, ILk/ILα (k=l,β1,4,β3,6,β2,7,9,10,15,γ1,5,γ2,3,γ4,β,γ), have been measured for some compounds of 66Dy, namely, Dy2O3, Dy2(CO3)3, Dy2(SO4)3, DyI2 and Dy metal by creating the Li(i=1–3) sub-shell vacancies in widely different proportions at two incident photon energies of 22.6 keV and 59.54 keV, in order to check the predicted dependence of these ratios on the incident photon energy and also investigate the influence of chemical effects on these ratios for an f-block element. The measurements were performed using the EDXRF spectrometer involving disk type radioactive sources of Cd109 and Am241 and a Peltier cooled Si PIN x-ray detector arranged in the 90° reflection geometry. The measured intensity ratios have been compared with the theoretical ILk/ILα values and those calculated using the two sets of fluorescence and Coster–Kronig yields available in literature in order to check the reliability of the theoretical/calculated values. Further, the measured ratio, ILγ4/ILα, was found to depend on the oxidation state of 66Dy as well as nature of ligand attached to it in a given compound.

► L x-ray intensity ratios for a rare-earth element are measured.
► Chemical effects on intensity ratios are investigated.
► Detailed comparisons between different measured and calculated intensity ratios are presented.