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Se + donors in silicon from deep level impurities. They were investigated with electron nuclear double resonance (ENDOR). The superhyperfine (SHF) interactions with eight shells of 29 Si neighbour nuclei were analysed and it was confirmed that the electron spin is S= 1 / 2 . The SHF structure is closely related to that of Si:S + and Si:Te + . This confirms that the chalcogens S + , Se + and Te + are on the same lattice site with T d symmetry.
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Gruelich-Weber et al. (1984) studied this question.
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