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An EPR spectrum, labeled Si-G29, is identified as a lattice vacancy trapped by substitutional tin. The resulting tin-vacancy pair is observed in its neutral ground state with S=1. Studies versus wavelength of illumination indicate that it has a donor level at Eₕ+0. 35 eV. Analysis of the EPR spectrum leads to a model in which the tin atom resides in a position halfway between two normal silicon atom sites (D₃₃). It is stable to 500 K.
G. D. Watkins (Sat,) studied this question.
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