The Configurations of Rotational Isomers and Their Normal Frequencies

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Abstract
Normal frequencies of molecular configurations of different azimuthal angles of internal rotation have been calculated for various molecules showing rotational isomerism. It has been shown that one can tell fairly accurately the value of azimuthal angle by comparing the observed frequencies (especially the skeletal deformation frequencies) with those calculated for different configurations. The sum rule for the rotational isomers similar to that for isotopic molecules has been derived and has been shown to be very useful in assigning the observed frequencies. The product rule for rotational isomers derived in our previous paper has also been applied to this problem and has been shown to be useful in determining the azimuthal angles of rotational isomers.