Abstract
Infrared absorption intensities of fundamental bands of propyl halides n-C 3 H 7 Cl, n-C 3H 7 Br and n-C 3H 7I were measured in the pure liquid state. In order to obtain L matrix data necessary for the intensity computation, normal frequencies of the rotational isomers were calculated, and LSFF force constants were determined by the least squares method so as to attain the best fit between the observed and calculated frequencies. By applying the absolute intensity method, energy differences between the rotational isomers were evaluated, which are in quite good agreement with values obtained by the temperature variation method.
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