Abstract
Using electron nuclear double resonance (ENDOR) of GaP crystals containing shallow S donors it was shown that the ENDOR spectra previously detected optically in the two infrared photoluminescence bands assigned to oxygen in oxygen-doped GaP are indeed due to S donors which must have been present simultaneously in those crystals. Furthermore it is shown that the results of the published ENDOR investigations of both S and Te donors in GaP must be revised. Finally the measured ligand hyperfine interaction of S and Te donors are discussed within the frame of effective mass theory.
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