Abstract
A study has been undertaken of the far‐infrared absorption of pure n‐propylbenzene in liquid, supercooled liquid, and solid phases. Broad band absorption is observed in the normal liquid. In the supercooled liquid the ’’molecular’’ mean relaxation time is very much longer than at room temperature. However, the supercooled liquid at 142 K still shows the existence of a broad band absorption near 85 cm−1 frequency very similar in appearance to that of the normal liquid at 203 K. The intensity of the lower‐frequency side of the broad band does not appear to have been reduced at low temperatures. The experimental data indicate that broad band absorption is not merely a high‐frequency component of the molecular relaxation process but arises from some separate type of motion. For the alkylbenzenes around room temperature, the microwave and far‐infrared data could be accounted for by the overlap of a molecular relaxation process with broad band absorption.
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