ESR studies of hydrogen hyperfine spectra in irradiated vitreous silica

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].