2p resonant photoemission study ofTiO2s

Abstract

Resonant photoemission measurements of ${\mathrm{TiO}}_{2}$ (100) at the Ti ${\mathrm{L}}_{2,3}$ edge are reported. For transitions from 2p to 3d states of ${\mathrm{e}}_{\mathrm{g}}$ symmetry there is a resonance enhancement of the intensity of the band-gap defect states by a factor of 6. The valence band shows resonance enhancements for transitions to states of both ${\mathrm{e}}_{\mathrm{g}}$ and ${\mathrm{t}}_{2\mathrm{g}}$ symmetry. The maximum enhancement of 3 for the high binding energy indicates that the whole of the O 2p derived valence band is hybridized with Ti 3d states, with the higher binding-energy part being more strongly mixed. The defect-state resonances are broader than the absorption resonances and have a width of about 4 eV due to the multiplet structure.