SynopsisThe far-infrared absorption between 3 and G.30 cm-' of several amino acids and polyamino acids is measured under a variety of conditions. The far-infrared spectra of amino acids and short-chain oliyomerr are extremely temperature dependent with the appearance of numerous narrow absorption lines at 4.2 K. There absorption lines broaden or disappear at 300 K or for absorption measiirenients on samples in solution. For longer polymers, relatively broad nearly temperature-independent absorption lines are observed with little difference between the spedra of polymers in solution or in the solid state. These results are explained in terms of the crystalline order of the samples.

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