Abstract
High resolution core level spectroscopy in combination with density functional theory calculations are used to study the satellite feature of the Ru-3d 5/2 core level spectrum whose interpretation is still a matter of debate. We present evidence that the satellite peak is not related to any structural properties of the RuO 2(1 1 0) surface. The binding energy shift between the Ru-3d 5/2 component and the satellite peak is close to the electron energy loss due to plasmon excitation. We propose therefore that the satellite peak is due to excitation of the RuO 2 plasmon.
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