Abstract
A unique ultraviolet and vacuum ultraviolet spectrophotometer was developed, which enables us to make measurements from 4 to 9.5 eV as photon energy, and over temperatures ranging from liquid helium to 2000°C. Elimination of thermal radiation, which is indispensable for the absorption measurement in the high temperature region, was achieved, and was demonstrated with a fused silica glass and 15.7GeO 2·84.3SiO 2 glass samples. Temperature dependence of the Urbach edge in both samples was measured. In addition a thermal equilibrium reaction between the 4.9 and 5.1 eV bands in Ge-doped silica glass was observed. Radiation damage of silica glass by a D 2 lamp as a light source for the spectrometer was investigated, and defect creation by its vacuum ultraviolet component during measurement was found to occur in some types of silica glass. Some measures to reduce the radiation damage were taken in this apparatus. Furthermore, an absorption band at 6.3 eV was detected.
Published Version
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