Abstract
The photon energy dependence of the photoionization cross section in a solid has been measured in the UV region (10h\ensuremath{\nu}25 eV) using an experimental method based on inverse photoemission. Measurements have been performed on low-d-occupancy transition metals (Ti, Zr, Hf, V, Nb, and Ta). The observed trend is in good qualitative agreement with the available atomic calculations, at variance with measurements around the Cooper minimum region (50h\ensuremath{\nu}200 eV), where strong modifications with respect to the isolated atom have been observed in previous experiments based on direct photoemission.
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