Abstract
The resonant X-ray Raman scattering spectra of rutile (TiO2), BaTiO3, and Ti2O3 were observed over a wide energy range around the Ti K absorption edge. Through these measurements, we revealed a process of X-ray Raman scattering by core excitonic excitations. Several types of excitations consisting of Ti 2p core holes with Ti 3d or 4p electrons, which are prototypical core excitons, were observed. The azimuth dependence of the excitations of single-crystal BaTiO3 revealed an anisotropic Ti 3d state in ferroelectric phase. The results show the possibilities for the extended use of X-ray Raman scattering to investigate the electronic structures of various materials.
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