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Crystalline Structure Determination of Anisotropic Dimethyl Terephthalate Crystallites by Micro-Raman Spectroscopy

Published online by Cambridge University Press:  31 January 2011

R. Rodrĺguez ,
S. Pacheco ,
S. Vargas ,
S. Jiménez  and
V. M. Castaño
R. Rodrĺguez*
Affiliation:
Departamento de Física Aplicada y Tecnología Avanzada, Instituto de Fsica, Universidad Nacional Autónoma de México, Apdo. Postal 0-1010, Querétaro, Qro. 76001, Mexico, and Departamento de Física, Universida Autonoma Metropolitana, Apdo. Posta 55-534, Mexico, DF 09340
S. Pacheco
Affiliation:
Subdirección Exploración Producción, Instituto Mexicano del Petróleo, Apdo. Postal 14-805, Mexico DF 07730
S. Vargas
Affiliation:
Departamento de Físcia Aplicada y Tecnología Avanzada, Instituto de Física, Universidad Nacional Autónoma de México, Apdo. Postal 0-1010, Querétaro, Qro. 76001, Mexico
S. Jiménez
Affiliation:
Laboratorio de Investigación en Materiales, Centro de Investigación y Estudios Avanzados, Apdo. Postal 1-1010, Querétaro, Qro. 76001, Mexico
V. M. Castaño
Affiliation:
Departamento de Física Aplicada y Tecnología Avanzada, Instituto de Física, Universidad Nacional Autónoma de México, Apdo. Postal 0-1010, Querétaro, Qro. 76001, Mexico
*
a)Address all correspondence to this author. e-mail: rogelior@servidor.unam.mx
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Abstract

A novel approach to determine the molecular orientation of dimethyl terephthalate molecules with respect to the direction of the crystal axis is reported. This determination was achieved by changing the crystal orientation with respect to the incident laser light of a micro-Raman spectrometer. Raman spectra were obtained at different incidence angles of the laser beam with respect to the crystal symmetry axis. The intensities of some specific bands were analyzed as a function of the tilting angle. With this information the molecular orientation with respect to the crystal axis was determined making use of a simple mechanical model.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 6 , June 2000 , pp. 1397 - 1403
Copyright
Copyright © Materials Research Society 2000

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References

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