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The electronic origins of the visible-light response of N-, C- and S-doped TiO 2 have been studied using X-ray absorption, X-ray emission, and X-ray photoelectron spectroscopies. New electronic states are observed in the bulk band gap, above the valence band edge of pure TiO 2 , which can be directly related to the visible-light absorption of the N-, C- and S-doped TiO 2 materials.
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