The oxidation-induced valence change of Yb leads to a single 4f hole in the ground state. The creation of the 4f ' configuration which does not exist for any pure rare-earth metal makes it possible to analyze the 4d~4f Fano resonance for a simple system experimentally as well as theoretically. Calculated Fano profiles for the 4f'2 final-state multiplets are in good agreement with photoemission measurements taken with the FLIPPER monochromator at Hamburger Synchrotronstrahlungslabor, Deutsches Elektronen-Synchrotron, using synchrotron radiation from the storage ring DORIS.
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