Abstract
The density of unoccupied p states of silver, palladium, and palladium silicide has been measured for the first time with high resolution by x-ray absorption at the ${M}_{\mathrm{I}\mathrm{V},\mathrm{V}}$ edges. Our results show that the ${M}_{\mathrm{I}\mathrm{V},\mathrm{V}}$-edge spectra yield information for 4d metals similar to that provided by K and ${L}_{\mathrm{I}}$ edge measurement on 3d metals. The densities of states are in agreement with theoretical predictions both in regard to energy and relative intensity. Changes in the palladium ${M}_{\mathrm{I}\mathrm{V},\mathrm{V}}$ spectra on silicide formation give the first direct evidence of the role of Pd 5p states in compound formation.
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