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Accurate measurements of low frequency polaritons have been made on the lowest phonon branch of A 1 ( z ) symmetry. Polariton peaks were clearly observed from ω p =76 cm -1 to 18 cm -1 . A dispersion relation of polaritons is accurately determined in the region q >90 cm -1 . The clamped dielectric constant ε 3 =26.6±0.3 is obtained.
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Kojima et al. (1980) studied this question.
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