Defect States at the ${\mathrm{TiO}}_{2}(110)$ Surface Probed by Resonant Photoelectron Diffraction

Defect States at the ${TiO}_{2} (110)$ Surface Probed by Resonant Photoelectron Diffraction

P. Krüger, S. Bourgeois, B. Domenichini, H. Magnan, D. Chandesris, P. Le Fèvre, A. M. Flank, J. Jupille, L. Floreano, A. Cossaro, A. Verdini, and A. Morgante

Phys. Rev. Lett. 100, 055501 – Published 4 February 2008

Abstract

The charge distribution of the defect states at the reduced ${TiO}_{2} (110)$ surface is studied via a new method, the resonant photoelectron diffraction. The diffraction pattern from the defect state, excited at the $Ti − 2 p − 3 d$ resonance, is analyzed in the forward scattering approach and on the basis of multiple scattering calculations. The defect charge is found to be shared by several surface and subsurface Ti sites with the dominant contribution on a specific subsurface site in agreement with density functional theory calculations.

Received 30 May 2006

DOI:https://doi.org/10.1103/PhysRevLett.100.055501

Authors & Affiliations

P. Krüger¹, S. Bourgeois¹, B. Domenichini¹, H. Magnan², D. Chandesris³, P. Le Fèvre³, A. M. Flank³, J. Jupille⁴, L. Floreano⁵, A. Cossaro⁵, A. Verdini⁵, and A. Morgante^5,6

¹Institut Carnot de Bourgogne, UMR 5209 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon Cedex, France
²Service de Physique et Chimie des Surfaces et Interfaces, CEA Saclay, 91191 Gif-sur-Yvette, France
³Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
⁴Institut des NanoSciences de Paris, CNRS, Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France
⁵Laboratorio Nazionale TASC-INFM, Elettra Synchrotron Light Source, 34012 Basovizza-Trieste, Italy
⁶Dipartimento di Fisica, Università di Trieste, Via Valerio 2, 34127 Trieste, Italy

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Vol. 100, Iss. 5 — 8 February 2008

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Physical Review Letters

Defect States at the TiO2(110) Surface Probed by Resonant Photoelectron Diffraction

P. Krüger, S. Bourgeois, B. Domenichini, H. Magnan, D. Chandesris, P. Le Fèvre, A. M. Flank, J. Jupille, L. Floreano, A. Cossaro, A. Verdini, and A. Morgante

Phys. Rev. Lett. 100, 055501 – Published 4 February 2008

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Defect States at the ${TiO}_{2} (110)$ Surface Probed by Resonant Photoelectron Diffraction