Abstract
In the present work a study of the thermal desorption of water adsorbed on a nearly perfect TiO 2(001) surface at 250 K is presented. Prior to the desorption experiments, the H 2O layer is characterized by ultraviolet photoelectron spectroscopy (UPS) and Auger electron spectroscopy (AES). Desorbed masses were identified using a quadrupole mass spectrometer (QMS). From an analysis of the UPS spectra, evidence is given for H 2O dissociation into OH and O TiH hydroxyl radicals bonded to the Ti atoms, with O Ti being one of the TiO 2 oxygen atoms. The thermal desorption spectra reveals water as the only desorbed species.
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