Infrared and polarized Raman spectra of dixanthinium tetrachlorozincate single crystal

Infrared and Raman spectra of LiV 2 O 5 single crystals

The phonon dynamics of LiV2O5 single crystals is studied using infrared and Raman spectroscopy techniques. The infrared-active phonon frequencies and dielectric constants are obtained by oscillator fitting procedure of the reflectivity data measured at room temperature. The Raman scattering spectra are measured at room temperature and at T=10 K in all nonequivalent polarized configurations. The...

Phase transition in single crystal Cs2Nb4O11.

We studied temperature dependence of complex capacitance, impedance, and polarized Raman spectra of single crystal Cs2Nb4O11. First, we observed a sharp lambda-shaped peak at 165 degrees C in the complex capacitance, then found drastic changes in the Raman spectra in the same temperature range. Utilizing the pseudosymmetry search of structure space group, we attributed the observed anomalies to...

Lattice Vibration Spectra. LXXV. IR Single Crystal Reflection Spectra of Sr(C103)2

Polarized infrared reflection spectra of Sr(C103)2 single-crystal plates are recorded and analysed for the frequencies of the transversal and longitudinal optical zone-centre phonon modes and other oscillator parameters by Kramers-Kronig analyses and both the classical 3 parameter (dielectric sum-function) and the 4 parameter (factorized form) oscillator-fit methods. The frequencies computed ar...

Investigation of the β-γ phase transition in single crystal malononitrile by polarized Raman spectroscopy

A polarized single crystal Raman study of the librational phonons in p-diiodobenzene

Single crystal polarized Raman spectra of p-diiodobenzene in the region from 0 to 300 em-I are presented for sample temperatures from 2 to 330 K. Eleven of the twelve predicted gerade librational phonons are unambiguously assigned in terms of their space group symmetries. The temperature dependence of the Raman spectra does not show a soft gerade phonon at the nearly second-order phase transiti...