ESR studies of hydrogen hyperfine spectra in irradiated vitreous silica

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Abstract
Various means of deuteration have been used to establish the hydrogenic origin of both the 119‐G and 74‐G hyperfine doublets observed in a variety of irradiated vitreous silica samples. The g values of both these defects appear inconsistent with an earlier model in which these lines were attributed to a hole localized on a hydroxyl group. Of the alternative models suggested by this experimental study, the most satisfactory attributes the 119‐G doublet to an electron trapped at a hydrogen‐compensated substitutional germanium impurity and the 74‐G doublet to an electron trapped at a silicon atom adjacent to an oxygen vacancy and in the immediate neighborhood of a hydrogen, a defect termed the [E2′/H].