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Transmission spectra are measured on extremly thin CdS single crystals with high quality in the energy range of exciton transitions from 1.8 °K to room temperature. Analysing the characteristics of the exciton absorption lines such as lineshapes, halfwidths, and oscillator strenghts it is found that the line An=1, E ⊥ c shows at low temperatures some “anomalies”, which cannot be explained in a model with weak exciton‐photon coupling but are qualitatively well understandable in a polariton model with spatial dispersion. This is caused by the fact that at low temperatures the exciton‐photon interaction prevails over the exciton‐phonon interaction resulting in a weakly‐damped polariton.
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J. Voigt (1974) studied this question.
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