title: Electron transfer-induced dynamics of oxygen molecules on the TiO2(110) surface.
abstract: Diffusion of oxygen molecules on transition metal oxide surfaces plays a vital role for the understanding of catalysis and photocatalysis on these materials. By means of time-resolved scanning tunneling microscopy, we provide evidence for a charge transfer-induced diffusion mechanism for O2 molecules adsorbed on a rutile TiO2(110) surface. The O2 hopping rate depended on the number of surface donors (oxygen vacancies), which determines the density of conduction band electrons. These results may have implications for the understanding of oxidation processes on metal oxides in general.
authors.affiliation: Interdisciplinary Nanoscience Center (iNANO), Center for Atomic-Scale Materials Physics (CAMP), and Department of Physics and Astronomy, University of Aarhus, DK-8000 Arhus C, Denmark.
authors.forename: Erik
authors.initials: E
authors.lastname: Wahlström
authors.forename: Ebbe Kruse
authors.initials: EK
authors.lastname: Vestergaard
authors.forename: Renald
authors.initials: R
authors.lastname: Schaub
authors.forename: Anders
authors.initials: A
authors.lastname: Rønnau
authors.forename: Majken
authors.initials: M
authors.lastname: Vestergaard
authors.forename: Erik
authors.initials: E
authors.lastname: Laegsgaard
authors.forename: Ivan
authors.initials: I
authors.lastname: Stensgaard
authors.forename: Flemming
authors.initials: F
authors.lastname: Besenbacher