Far-infrared spectra of t-butyl bromide-h9 and -d9 in the liquid and three solid phases

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Abstract
The far‐infrared spectra of the liquid and three solid phases of t‐butyl bromide‐h9 and ‐d9 have been recorded between 200 and 10 cm−1. Strong absorption only occurs below 100 cm−1, where the liquid and the two plastic crystal phases, I and II, show a broad featureless band, whose frequency of maximum absorption increases with decreasing temperature. Relaxation processes and mixed translational‐rotational vibrations contribute to the band, but the vibrations determine the frequency of maximum absorption. The spectra of solid phase III at 90°K show eight features that are assigned to lattice modes and indicate that the solid is ordered with at least two molecules per primitive unit cell. At 195°K phase III is orientationally disordered.

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