Abstract
We report on a resonant photoemission study of CuO at the LIII soft-x-ray absorption threshold. The valence-band spectra exhibit a strong enhancement of electron emission at resonance, which is shown to be due to an incoherent superposition of a strong signal from an L3M4,5M4,5 Coster Kronig decay of the core-ionized state and a much weaker photoemission signal. This finding is in strong contrast to the recent claim of a giant Fano-type photoemission resonance in this system.
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