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http://hdl.handle.net/1843/61188
Tipo: | Artigo de Periódico |
Título: | Infrared dispersion analysis and raman scattering spectra of taurine single crystals |
Autor(es): | Roberto Luiz Moreira Ricardo P. S. M. Lobo Anderson Dias |
Resumen: | 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. |
Asunto: | Taurina Aminoácidos Raman, Efeito de Espectroscopia de infravermelho Determinação de tamanho de partícula Cristais Detectores químicos |
Idioma: | eng |
País: | Brasil |
Editor: | Universidade Federal de Minas Gerais |
Sigla da Institución: | UFMG |
Departamento: | ICX - DEPARTAMENTO DE FÍSICA ICX - DEPARTAMENTO DE QUÍMICA |
Tipo de acceso: | Acesso Restrito |
Identificador DOI: | https://doi.org/10.1016/j.saa.2017.07.017 |
URI: | http://hdl.handle.net/1843/61188 |
Fecha del documento: | 2018 |
metadata.dc.url.externa: | https://www.sciencedirect.com/science/article/pii/S1386142517305760 |
metadata.dc.relation.ispartof: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy |
Aparece en las colecciones: | Artigo de Periódico |
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