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Abstract:
The autoionization of excited core hole states of simple adsorbates has attracted considerable attention. It provides information on the local electronic density of the valence levels. However, mainly simple adsorbates on different metal surfaces have been investigated. Here it was of considerable interest to study autoionization on oxide surfaces because effects due to the substrate are expected to be different from metals. Angle resolved autoionization spectra after resonant Cls→2π excitation of CO on different epitaxially grown metal oxide surfaces are presented for the first time. The spectra resemble the autoionization spectrum of CO in the gas phase. Differences between spectra on oxide surfaces and on metal surfaces are discussed.
