Vibrational spectra of single-crystal topaz |
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| Authors: | J. M. Beny B. Piriou |
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| Affiliation: | 1. C.R.S.C.M., 1A, rue de la Férollerie, F-45071, Orléans Cedex 2, France
2. Laboratoire des Elements de transition dans les Solides C.N.R.S. 1, place A. Briand, F-92195, Meudon, Principal Cedex, France
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| Abstract: | A single-crystal of topaz was studied by Raman spectroscopy to assign the internal modes of the high-frequency range and to compare with infrared data. All active modes exhibit an important Davydov splitting (150 cm?1) but we have found a small Bethe splitting (14.5 cm?1) consistent with a very regular SiO4 tetrahedron. Because of a high value of v 1 (～920 cm?1) the Raman active modes present a mixed v 1/v 3 character. Finally the substitution of OH for F splits an A g internal mode and lead to some proper modes at 3650 cm?1, 3639 cm?1 and 1165 cm?1. |
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