Abstract
AbstractOptical properties of vitreous SiO2with 7.4 wt.% TiO2are found by dispersion analysis of reflectivity measured in the infrared, visible, and ultraviolet augmented with literature values of vacuum‐ultraviolet reflectivity and absorption. The principal infrared absorption associated with the titanium dopant occurs at 950 cm−1in a deep minimum of the host silica absorption. We attribute this to a perturbation of the silica's absorption at 1076 cm−1involving oxygen atoms bridging SiO4and TiO4tetrahedra. Strong ultraviolet absorptions of Ti4+occur just below the silica exciton peak between 5.5 and 7.8 eV. We attribute these to charge‐transfer transitions at TiO4tetrahedra; i.e., bound excitons consisting of a Ti3+ion and a hole shared by four oxygen neighbours. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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