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Coverage-dependent two-photon photoexcitation at the H2O/TiO2 interface

Payne, DT; Zhang, Y; Pang, CL; Fielding, HH; Thornton, G; (2016) Coverage-dependent two-photon photoexcitation at the H2O/TiO2 interface. Surface Science , 652 pp. 189-194. 10.1016/j.susc.2016.02.018. Green open access

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Abstract

Excited electrons and holes are crucial for redox reactions on metal oxide surfaces. However, precise details of this charge transfer process are not known. We report two-photon photoemission (hν = 3.23 eV) measurements of rutile TiO2(110) as a function of exposure to water below room temperature. The two-photon resonance associated with bridging hydroxyls is enhanced following water exposure, reaching a maximum at a nominal coverage of one monolayer. Higher coverages attenuate the observed resonance. Ultraviolet photoemission spectroscopy (hν = 21.22 eV) of the initial, band gap states shows little change up to one monolayer water coverage. It is likely that the enhancement arises from dissociation within the adsorbed water monolayer, although other mechanisms cannot be excluded.

Type: Article
Title: Coverage-dependent two-photon photoexcitation at the H2O/TiO2 interface
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.susc.2016.02.018
Publisher version: http://dx.doi.org/10.1016/j.susc.2016.02.018
Language: English
Additional information: Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keywords: TiO2; Hydroxyls; Photoexcitation; Water; 2PPE
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1501048
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