The radio-frequency and microwave spectra of the Ar·O3 and Ar·SO2 Van der Waals complexes have been analysed with the conventional first-order centrifugal distortion Hamiltonian plus inversion and centrifugal distortion of the inversion frequency. The centrifugal distortion constants were then used to obtain a force field describing the Van der Waals vibrations. This procedure worked quite well for Ar·O3, generating vibrational properties appropriate for a semi-rigid complex. Ar·SO2, however, cannot be described by such a harmonic model. Ar·SO2 has a very isotropic Van der Waals potential where stretching and bending vibrations are strongly coupled. In addition, a qualitative study of many SO2-containing bimolecular complexes was made. It was possible to categorize these complexes as having strong, moderate or weak interactions.
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Muenter et al. (1982) studied this question.