Abstract
The formation mechanisms of oxygen-deficient defects in synthetic silica glass sintered under vacuum were studied. 7.6 and 5.0 eV optical absorption bands in the glasses were measured with synchrotron-orbital-radiation light, and photoluminescence excited by a KrF excimer laser also was measured. It is concluded that these 7.6 eV absorption defects are generated by elimination of chlorine in the vapor-phase axial deposition soot body, and that the 7.6 and 5.0 eV absorption bands exist with a constant ratio.
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