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Reflection and absorption of light by InSe single crystals are investigated in the range of wave numbers 500 to 100 cm‐1. The measurements are carried out at room temperature in E ⟂ C orientation of the electric vector. The linear chain model is used for calculating the phonon frequencies at k = 0. The phonon energies at the edge of the Brillouin zone (M point) are calculated by means of the force constants model including the atoms of a single layer.
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Belenkii et al. (1977) studied this question.
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