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Polarized infrared-reflectivity spectra have been obtained for Czochralski-grown YF 3 and LuF 3 single crystals, at room temperature. At this temperature these crystals exhibit an orthorhombic symmetry belonging to the Pnma (D2h16) space group, known as β-YF 3 . The measured spectra were analyzed based on the factor-group method and on the fitting with the four-parameter semi-quantum...
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