Abstract

Paramagnetic defects induced by sub‐bandgap light have been observed in vitreous SiO2. These defects are stable at room temperature, but anneal well below Tg. The observed EPR spectrum changes as the excitation photon energy is varied, and is sensitive to the hydrogen content of the material. Other photoinduced effects include a mid‐gap absorption band and photogenerated luminescence centers. The behavior of a‐SiO2 is compared to that of the narrow‐gap chalcogenide glasses.

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