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An ENDOR study of the hole centre near an aluminium atom in smoky quartz gives the hyperfine interaction as A/sub ///=-14.08(5) MHz, A perpendicular to =-17.34(10) MHz, and the quadrupole interactions as P=+1.58(2) MHz, eta =0.0(3).
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P.R. Barker (1975) studied this question.
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