Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/61188
Type: Artigo de Periódico
Title: Infrared dispersion analysis and raman scattering spectra of taurine single crystals
Authors: Roberto Luiz Moreira
Ricardo P. S. M. Lobo
Anderson Dias
Abstract: 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.
Subject: Taurina
Aminoácidos
Raman, Efeito de
Espectroscopia de infravermelho
Determinação de tamanho de partícula
Cristais
Detectores químicos
language: eng
metadata.dc.publisher.country: Brasil
Publisher: Universidade Federal de Minas Gerais
Publisher Initials: UFMG
metadata.dc.publisher.department: ICX - DEPARTAMENTO DE FÍSICA
ICX - DEPARTAMENTO DE QUÍMICA
Rights: Acesso Restrito
metadata.dc.identifier.doi: https://doi.org/10.1016/j.saa.2017.07.017
URI: http://hdl.handle.net/1843/61188
Issue Date: 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
Appears in Collections:Artigo de Periódico

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