Observation of UV-induced Auger features in catechol adsorbed on anatase TiO 2 (101) single crystal surface

Abstract

We have investigated the electronic structure of catechol adsorbed on the anatase TiO 2 (101) surface under illumination with ultraviolet (UV) light (4.75 eV) using resonant photoemission spectroscopy. UV illumination results in the appearance of a strong Ti MVV (M refers to photoionization of 3p level and VV the Auger decay process via the valence levels) feature at a kinetic energy of 26.2 eV. This is attributed to the creation of localised states following catechol to Ti-3d excitation by the UV source. A sharp resonance attributed to excitation from Ti 3p states into these localised states is observed in constant final state spectra. © 2012 American Institute of Physics.