A polarized single crystal Raman study of the librational phonons in p-diiodobenzene
- 1 February 1976
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 64 (3), 1140-1145
- https://doi.org/10.1063/1.432302
Abstract
Single crystal polarized Raman spectra of p‐diiodobenzene in the region from 0 to 300 cm−1 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 transition which occurs at 326 K. A significant anharmonicity for molecular motions above the I–I axis is indicated by the observation of overtones and combinations and broadening of these phonons as the temperature is raised from 2 K.Keywords
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