Abstract
Spectral characteristics representing the distribution of unoccupied conduction-band states in the 3 d transition-series metals Fe, Co, Ni and Cu, obtained using soft X-ray absorption (SXA), bremsstrahlung isochromat (BI) and characteristic isochromat (CI) methods, are related mathematically to those found in soft X-ray appearance-potential Spectroscopy (SXAPS) on the basis of the one-electron band approximation. These mathematical relationships are used to compute SXAPS spectra from reported experimental data obtained by the SXA, BI and CI methods. For the metals considered, the correlations between the computed and experimental SXAPS spectra are found to be good. The observed discrepancies are attributed to differences in the selection rules of the excitation processes, to the effect of the core vacancy on the final state, and to many-body phenomena which are not included in the simplified one-electron band model.
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