Abstract
Measurements of electron spin resonance are carried out on X- and γ-ray irradiated single crystals of phosphorus-doped quartz. A pair of absorption lines showing hyperfine interaction with a nuclear spin of phosphoric ion is observed at room temperature. This ESR signal is ascribed to a paramagnetic center of C 2 symmetry having g and A tensor components of g 1 =2.0011, g 2 =2.0025, g 3 =2.0003 and | A 1 |=1065, | A 2 |=1049, | A 3 |=989 in units of 10 -4 cm -1 , respectively. The center is considered to be an s -like electron localized at a substitutional pentavalent phosphoric ion surrounded by four oxygen ions.
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