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The results of a relativistic tight-binding energy-band model for Pt and Au, utilizing parameters derived from Smith's empirically adjusted combined interpolation scheme, are applied to calculate the one-electron contribution to various x-ray and energy-loss spectra involving 4f and 2p core states in these materials. These results show that the unoccupied holes in the Pt 5d bands have predominantly j=52 character (h₅₂) such that the (h₅{₂}{h₃₂}) ratio ranges from 3. 5 within 0. 5 eV of E₅ to 2. 9 over the entire unoccupied conduction band. Taking into account dipole transition probabilities, the former ratio leads to a predicted line-strength ratio I{₍₇}{I₍₆}2. 9 near threshold for excitations involving the 4fj=72 (N₇) and j=52 (N₆) core levels in Pt. This result is in good agreement with the corresponding experimental ratios that are derived from electron energy-loss (2. 5) and x-ray-absorption (2. 3) spectra. Comparable agreement is obtained between the calculated and observed (electron-energy-loss) I{₍₇}{I₍₆} ratios in Au. The present results are applied to calculate the N₆-N₇ x-ray emission spectra in both Pt and Au and to interpret the L₂-L₃ absorption-edge data in Pt.
Mattheiss et al. (Fri,) studied this question.