Abstract
The authors present angle integrated isochromat spectra (11.1 eV<hv<22.5 eV) from six low-d-occupancy transition metals (Ti, V, Zr, Nb, Hf and Ta). In all cases the spectral shape basically reflects the energy distribution of the empty electron states: the agreement is, however, less satisfactory if compared with the same measurements for noble and near-noble metals and with X-ray inverse photoemission from the whole 3d and 4d series. The paper is focused on the observed discrepancies and on the possible role of secondary electron background cross section and many-body effects in determining the spectral shape.
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