Infrared spectroscopy of SO2 clusters in rare gas matrices revisited: Assignment of species in Ar matrix

We have observed infrared spectra of the SO2 clusters in rare gas matrices (Ar, Kr, Xe). The spectral dependence on temperature and concentration led us to the firm assignment of the SO2 dimer in Kr and Xe, the result of which was used to reassign dimeric vibrational transitions in Ar that have been controversial for more than ten years.