Abstract
The energy dependence of the Bremsstrahlung transition in the X-ray region is investigated within the framework of inverse photoemission. Theoretical Bremsstrahlung isochromat spectra (BIS) are calculated for solid Ni and Pd and compared with experimental BIS data reported for isochromat energies between 0.5 and 5 keV. It is shown that this formulation provides a detailed description of the BIS measurements for all the isochromat energies considered. In particular it is demonstrated that the drastic redistribution of spectral weight observed for the 3d and 4d transition metals is related to a strong dependence of the transition-matrix elements for d symmetry. This affects the analysis of BIS data not only for the unoccupied states near the Fermi level but also over a wide energy range.
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