Polaritons in centrosymmetric crystals (SrTiO₃ and KTaO₃) have been studied by small-angle light scattering induced by external electric fields. Measurements of polariton dispersion curves in SrTiO₃ have produced new values for oscillator strengths of the infrared-active phonons. Absence of a measurable k dependence for the linewidth of the "ferroelectric" mode bears on the discrepancy between Raman and infrared linewidth measurements previously reported.
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Scott et al. (1969) studied this question.
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