Abstract
The neutron inelastic spectra of solid 1,4-dibromobutane and 1,5-dibromopentane have been taken at several temperatures. The observed neutron spectra are assigned to the skeletal bending and torsion modes on the basis of normal coordinate calculations, in which only intramolecular valence force fields are used. The spectral assignments are consistent with the GG conformer being the predominant species in solid 1,4-dibromobutane while the TT conformer is predominant in 1,5-dibromopentane; lesser amounts of the TT isomer in the former and the GG isomer in the latter have also been identified.
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