Abstract
A far infra-red study of pentachloronitro benzene and pentachloro aniline is presented. These molecular crystals exhibit, as an intrinsic property, a considerable molecular orientational freedom. The spectra of the first is treated with two models of the molecular dynamics. The first, due to Frenkel, assumes that the dynamics of the disorder conform to a description of the motion in terms of random jumps occurring between discrete orientational sites. The second, of more recent origin, is the itinerant oscillator model corrected for inertia which is formally identical to a Mori three variable formalism. These molecular cystals, in which the Debye and librational absorptions are separated by some eleven decades of frequency, provide a severe test for this model.
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