Abstract
The torsional and skeletal bending fundamentals in solid n ‐pentane, n ‐hexane, n ‐heptane, and n ‐octane are measured by the method of cold neutron inelastic scattering. For this series of n ‐paraffins, the maximum frequencies of the skeletal torsion and skeletal bending modes approach 190 and 500 cm−1, respectively, in agreement with previous measurements on polyethylene. The average frequency of the two end‐methyl torsions is found to be 240 cm−1. A normal coordinate analysis, performed using only intramolecular valence force fields for each molecule, is used as a guide in spectral assignments. These results are compared to theoretical dispersion curves of polyethylene, with and without intermolecular forces. Chain‐end effects appear to be of little significance for these low‐frequency modes, even in chain lengths as short as seven or eight carbons.
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