Wet Electrons at the H 2 O/TiO 2 (110) Surface
- 20 May 2005
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 308 (5725), 1154-1158
- https://doi.org/10.1126/science.1109366
Abstract
At interfaces of metal oxide and water, partially hydrated or “wet-electron” states represent the lowest energy pathway for electron transfer. We studied the photoinduced electron transfer at the H 2 O/TiO 2 (110) interface by means of time-resolved two-photon photoemission spectroscopy and electronic structure theory. At ∼1-monolayer coverage of water on partially hydroxylated TiO 2 surfaces, we found an unoccupied electronic state 2.4 electron volts above the Fermi level. Density functional theory shows this to be a wet-electron state analogous to that reported in water clusters and which is distinct from hydrated electrons observed on water-covered metal surfaces. The decay of electrons from the wet-electron state to the conduction band of TiO 2 occurs in ≤15 femtoseconds.Keywords
This publication has 36 references indexed in Scilit:
- Observation of Large Water-Cluster Anions with Surface-Bound Excess ElectronsScience, 2005
- A Fresh Look at Electron HydrationScience, 2004
- Hydrated Electron Dynamics: From Clusters to BulkScience, 2004
- The surface science of titanium dioxideSurface Science Reports, 2003
- Ultrafast Dynamics of Electron Localization and Solvation in Ice Layers on Cu(111)Physical Review Letters, 2002
- Imaging Water Dissociation onPhysical Review Letters, 2001
- From ultrasoft pseudopotentials to the projector augmented-wave methodPhysical Review B, 1999
- Ab initiomolecular-dynamics simulation of the liquid-metal–amorphous-semiconductor transition in germaniumPhysical Review B, 1994
- Si(100)-(2×1) surface defects and dissociative and nondissociative adsorption ofO studied with scanning tunneling microscopyPhysical Review B, 1993
- Solvated electron structure in glassy matrixesAccounts of Chemical Research, 1981