Polarization dependence of soft-x-ray Raman scattering at the L edge of TiO2

Polarization dependence of soft-x-ray Raman scattering was investigated at the Ti 2p absorption edge of TiO2. Strong Raman scattering feature appears about 14 eV below elastic peaks with strong polarization dependence. These Raman scattering structures are charge transfer excitations to the antibond ing state between 3d(1)L(-1) and 3d(0) states, because they are enhanced wh en the incident photon energies are tuned at satellite structures of Ti 2p absorption spectrum. Broad Raman scattering structures are found between 3 eV and 10 eV below elastic peaks. They are assigned to be nonbonding type c harge transfer excitations or interband transition from O 2p valence to Ti 3d conduction bands, which includes the crystal field splitting in D-2h sym metry with two Ti-O bond lengths.