Decay channels for the Ti(2p1/2) core hole excitations in TiO2 observed by x-ray Raman scattering

J. Jiménez-Mier, U. Diebold, D. Ederer, T. Callcott, M. Grush, R. Perera

Instituto de Ciencias Nucleares, UNAM, 04510 México DF, Mexico
Department of Physics, Tulane University, New Orleans, LA 70118, U.S.A.
Physics Department, University of Tennessee, Knoxville, Tennessee 37996, U.S.A.
Lawrence Berkeley Laboratory, Berkeley, California 94720, U.S.A.

Phys. Rev. B 65 (2002) 184105

We present high-resolution x-ray fluorescence spectra, corrected for self-absorption, following resonant excitation of a Ti(2p1/2) electron in TiO2. Several transitions are studied that show complex behavior as a function of photon excitation energy, indicative of interaction in the excitation and decay channels. Three peaks are identified as transitions resulting from the excitation of a 2p1/2 electron, one of them corresponding to direct valence emission with a 3d spectator electron and the other two to participator emission following the Coster-Kronig decay of the 2p1/2 hole. Additional emission features at higher photon energies correspond to valence emission in the presence of a charge-transfer excitation that has been found in the 2p x-ray photoelectron spectroscopy spectrum, and also in the x-ray absorption spectrum. A detailed analysis of the energy dispersion versus excitation energy provides information about the dynamical processes involved. The results are interpreted in terms of the calculated band structure of the compound.

Corresponding author: Ulrike Diebold (diebold at iap_tuwien_ac_at).

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