Abstract
The LIII X-ray absorption spectra of some binary and ternary compounds of dysprosium have been recorded using a 0.4m diameter Cauchois-type bent-crystal spectrograph. It is observed that the LIII absorption discontinuity in the compounds shifts to the high-energy side with respect to that in the dysprosium metal. The chemical shifts are found to be governed by the effective charges on the absorbing ions, which are calculated on the basis of Suchet's theory. The plot of the chemical shift, Delta E, against the effective ionic charge, q, has been used to determine the charges in the ternary intermetallic compounds in which they cannot be calculated theoretically. The extended X-ray absorption fine structure (EXAFS) is interpreted with the help of the graphical method given by Lytle and co-workers.
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