Abstract
Measurements have been made of the absorption of ultrasonic waves at frequencies in the range 10 to 200 Mc/s in
sym
-tetrabromoethane from 0 to 60°C and in tri-
n
-butylamine from – 60 to 60°C. For both liquids the absorption is determined in part by a relaxing process which is associated with the equilibrium between rotational isomers. The results for
sym
-tetrabromoethane are compared with infra-red data obtained by Kagarise (1956), and the potential energy barriers hindering rotation between the
gauche
and
trans
forms of the molecule are determined from the measurements. The energy parameters associated with a two-state model for tri-
n
-butylamine are evaluated and compared with previous results for triethylamine. This leads to a molecular interpretation of the isomeric configurations responsible for the observed relaxation.
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