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Spectres Raman de Basses Frequences de Cristaux de Derives Benzeniques Paradisubstitues: p ‐Br 2 C 6 H 4 , p ‐Br 2 C 6 D 4 , p ‐BrClC 6 H 4 et p ‐ClC 6 H 4 . Étude du désordre dans le dérive p ‐ BrClC 6 H 4
Author(s) -
Le. Calvé N.,
Parent S.,
Pasquier B.
Publication year - 1974
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250020414
Subject(s) - raman spectroscopy , chemistry , lattice vibration , physics , crystallography , condensed matter physics , optics , phonon
An assignment of the Raman active lattice modes in terms of factor group symmetry species and rotational vibrations is given for paradibromobenzene‐H 4 and ‐D 4 , parabromochlorobenzene and parachloroiodobenzene. The analysis of the Raman spectra of mixed crystals of paradibromobenzene and paradichlorobenzene at 90K with 1 cm −1 resolution and the temperature dependence of the linewidths of the three librations are evidence for the static nature of the disorder in the unsymmetrical derivatives.