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Abstract
The absorption coefficient of the 4-n-alkyl-4′-cyano biphenyls has been studied in the submillimetre wave range 50–220 cm−1. Molecular processes which give rise to superimposed but distinct absorption bands are reported. These processes have been analysed using a multi-oscillator model for the observed absorption and are assigned to the Poley absorption as well as to intermolecular and intramolecular mechanisms. Spectra at temperatures in the range 20–70°C and of solutions in cyclohexane support the proposed assignments.