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Raman study of LiCsSO 4

1991; Wiley; Volume: 164; Issue: 2 Linguagem: Inglês

10.1002/pssb.2221640227

1521-3951

V. Lemos, Eduardo Silveira, F. E. A. Melo, J. Mendes Filho, Jennifer Pereira,

Nonlinear Optical Materials Research

Abstract Polarized Raman spectra of single crystals of LiCsSO 4 are obtained. It is found that factor group analysis isolated fails to give a consistent interpretation of the spectra. Hence, a complementary calculation, based on a group theoretical method, is employed to obtain the relative intensities for all of the internal modes. This calculation yields zero intensity for the B 1g mode of the v 1 ‐type of vibration, so that the corresponding observed band is/assumed to be the A g symmetry mode, exclusively. Several calculated intensities result in almost negligible values for other A g and B 1g modes. This fact is particularly helpful in the analysis of experimental data thus improving assignments of the Raman bands.