Librational mode linewidths of thiourea

I. Laulicht; E. Pellach; M. Brith

doi:10.1063/1.1678677

Librational mode linewidths of thiourea

I. Laulicht, E. Pellach, M. Brith

Department of Physics

Bar-Ilan University

Research output: Contribution to journal › Article › peer-review

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Abstract

Raman spectra of polycrystalline thiourea were measured at various temperatures above and below the 169°K ferroelectric phase transition. No "soft" mode was found. The temperature dependence of two libration linewidths was analyzed by using a theory which is a combination of Ivanov et al.'s theory for Raman linewidths in molecular crystals and Brot's theory for the preexponential factor in activated reorientational processes. Agreement with theory is good as far as the reorientational contribution to the linewidth is concerned.

Original language	English
Pages (from-to)	2857-2861
Number of pages	5
Journal	Journal of Chemical Physics
Volume	57
Issue number	7
DOIs	https://doi.org/10.1063/1.1678677
State	Published - 1972

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AB - Raman spectra of polycrystalline thiourea were measured at various temperatures above and below the 169°K ferroelectric phase transition. No "soft" mode was found. The temperature dependence of two libration linewidths was analyzed by using a theory which is a combination of Ivanov et al.'s theory for Raman linewidths in molecular crystals and Brot's theory for the preexponential factor in activated reorientational processes. Agreement with theory is good as far as the reorientational contribution to the linewidth is concerned.

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Librational mode linewidths of thiourea

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