Far infra-red absorption spectra of the monohalo-benzenes in the liquid and polycrystalline phases

Abstract
The far infra-red (20–400 cm-1) spectra of C6H5F, C6H5Cl, C6H5Br, C6H5I, C6D5Cl, C6D5Br have been recorded for the liquid (300°K) and polycrystalline phases (100°K). The expected lattice spectra and correlation field splittings have been discussed in terms of group theory, and the observed frequency shifts are used to assign the absorption bands to particular motions in the unit cell.

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