Infrared matrix isolation spectra of SF6 dimers

The infrared spectra of 32SF6, 33SF6 and 34SF6 dimers were studied in argon and nitrogen matrices. The spectra of SF6 dimers of like and unlike isotopomers were also calculated taking into account the resonance dipole–dipole and dipole-induced dipole interactions between two triply degenerate oscillators. Two absorption bands with site structure are observed for (32SF6)2, (33SF6)2 and (34SF6)2 in argon; the νX,Y band is blue shifted and the νZ band is red shifted from the ν3 SF6 band in accordance with calculated spectra. Three and two components of the predicted quadruplets are identified for 32SF6–34SF6, 32SF6–33SF6, respectively. In the spectra of (SF6)2 in nitrogen matrices the splitting of νX,Y component of the resonance doublet was observed.