Abstract
Cobaltocene was adsorbed in UHV at 100 K onto cleaved pyrolytic graphite. The adsorbate bonding as well as the electronic properties of the interface were investigated by UPS and XPS. For cobaltocene exposures < 1.6 L, a partial oxidation of the adsorbate is observed. At higher exposures, molecular adsorption occurs. The different adsorption modes are indicated by a significant change in the adsorbate induced A′ emissions, an increase in the density of states (DOS) near the Fermi level in the valence band spectra (HeI, HeII) and an oxidized cobalt species in the XP spectra. During annealing to room temperature, the molecularly adsorbed species is desorbed. The potentials and adsorbate DOS at the interface are interpreted in terms of an electrochemical redox equilibrium and compared with electrolyte solutions.
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