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Radiation-induced optical absorption in crystalline SiO2 has been investigated in a number of synthetic quartz crystals. The dominant visible absorption band peaks at 2.5 eV and correlates directly with the paramagnetic resonance signal of the (Ale+)0 center. Similarities in behavior with the V− center in MgO suggest that a small polaron theory is applicable.
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N. Koumvakalis (1980) studied this question.
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