Polar optic phonons in Hg2Cl2 and Hg2Br2 |
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| Authors: | J Petzelt I Mayerová ? Bárta L D Kislovskii |
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| Institution: | (1) Institute of Physics, Czechosl. Acad. Sci., Na Slovance 2, Praha 8, Czechoslovakia;(2) Institute of Solid State Physics, Czechosl. Acad. Sci., Cukrovarnicka 10, Praha 6, Czechoslovakia;(3) Institute of Crystallography, Acad. Sci. USSR, Leninskij prospekt 59, V-333 Moscow, USSR |
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| Abstract: | Far infrared (30–430 cm?1) reflectivity measurements of Hg2Cl2 and Hg2Br2 single crystals have been performed in polarized light. The spectra, which are in agreement with group-theoretical predictions, were analyzed by the oscillator fitting procedure and Kramers-Kronig method. The results are compared with the existing data from other measurements and the large anisotropy of polar modes is briefly discussed. The polarization vectors of all long-wavelength symmetry modes were determined group-theoretically. |
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