Infrared dispersion analysis and Raman scattering spectra of taurine single crystals.
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2018
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A comprehensive set of optical vibrational modes of monoclinic taurine crystals was determined by Raman scattering,
and infrared reflectivity and transmission spectroscopies. By using appropriate scattering/reflection geometries,
the vibrational modes were resolved by polarization and the most relevant modes of the crystal
could be assigned. In particular, we were able to review the symmetry of the gerade modes and to resolve ambiguities
in the literature. Owing to the non-orthogonal character of Bu modes in monoclinic crystals (lying on the
optic axial plane), we carried out a generalized Lorentz dispersion analysis consisting of simultaneous adjust of
infrared-reflectivity spectra at various light polarization angles. The Au modes (parallel to the C2-axis) were treated
within the classical Lorentz model. The behavior of off-diagonal and diagonal terms of the complex dielectric
tensors and the presence of anomalous dispersion were discussed as consequences of the low symmetry of the
crystal.
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Taurine, Infrared spectroscopy, Raman spectra, Amino acids
Citação
MOREIRA, R. L.; LOBO, R. P. S. M.; DIAS, A. Infrared dispersion analysis and Raman scattering spectra of taurine single crystals. Spectrochimica Acta Part A-Molecular And Biomolecular Spectroscopy, v. 188, p. 276-284, 2018. Disponível em: <https://www.sciencedirect.com/science/article/pii/S1386142517305760?via%3Dihub>. Acesso em: 05 abr. 2018.