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The infrared absorption and Raman spectra of Li-compensated B-doped c-Si have been measured. The splitting of the local mode due to B-Li pairs has been calculated with a valence force-field model. A quasilocal mode has been observed at 225 cm^-1. The effective charges of these modes have been estimated from the strength of the absorption bands and compared with calculations based on Harrison's bond-charge model.
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Cardona et al. (1981) studied this question.
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