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Wet Electrons at the $H_{2}O/TiO_2(110)$ Surface

Ken Onda, Bin Li, Jin Zhao, Kenneth D. Jordan, Jinlong Yang and Hrvoje Petek
Science
New Series, Vol. 308, No. 5725 (May 20, 2005), pp. 1154-1158
Stable URL: http://www.jstor.org/stable/3842099
Page Count: 5
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Wet Electrons at the $H_{2}O/TiO_2(110)$ Surface
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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 $H_{2}O/TiO_2(110)$ interface by means of time-resolved two-photon photoemission spectroscopy and electronic structure theory. At ~ 1-monolayer coverage of water on partially hydroxylated 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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