Onda, K and Li, B and Zhao, J and Jordan, KD and Yang, J and Petek, H
(2005)
Wet electrons at the H<inf>2</inf>O/TiO<inf>2</inf>(110) surface.
Science, 308 (5725).
1154 - 1158.
ISSN 0036-8075
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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 2O/TiO2(110) interface by means of time-resolved two-photon photoemission spectroscopy and electronic structure theory. At ∼1-monolayer coverage of water on partially hydroxylated TiO2 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 TiO2 occurs in ≤15 femtoseconds.
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