Free jet infrared spectroscopy of (28SiF4)2 in the 10 μm region

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Abstract
The rotation–vibration spectra of 28SiF4 dimer have been studied near the ν3 band of monomer 28SiF4. A well‐resolved parallel band has been observed 17.5 cm−1 below the monomer band origin. Two perpendicular bands, separated by 2.0 cm−1 and located 4.3 cm−1 above the origin for the lower component, show equidistant Q‐branch peaks as only resolved lines. The observed band structure indicates that the threefold degeneracy of the vibrational motions in SiF4 is all removed. A C2h structure with a pair of SiF bonds in an antiparallel position is proposed.