Photoemission and Bremsstrahlung Isochromat Spectroscopy Studies of TiO2 (Rutile) and SrTiO2.
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Photoemission and bremsstrahlung isochromat spectra have been measured on TiO<SUB>2</SUB> (rutile) and SrTiO<SUB>3</SUB>. The magnitudes of the fundamental band gaps estimated from the combined spectra agree well with the results of the photoabsorption and the energy-band calculations. The profiles of the observed spectra do not reveal the fine structure expected to occur in the density-of-states curves obtained by the energy band calculations, suggesting the existence of a mechanism to smear out the fine structure considerably. The combined spectra are used to interpret the charge-transfer-type satellite manifest in the core-level spectra. For 3s photoemission, satellite features ascribed to the configuration interaction between the 3s3p<SUP>6</SUP> and 3s<SUP>2</SUP>3p<SUP>4</SUP>3d states in the atomic notation are also observed.
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