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 = 5/2 character (h», ) such that the (h5/2/A3/2) ratio ranges from -3.5 within 0.5 eV of EF 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",/I", -2.9 near threshold for excitations involving the 4fj = 7/2 (N,) and j = 5/2 {N,) 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)
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