Analysis of 3ν3 in SF6

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Abstract
Studies of the 3ν3 absorption band in SF6 in the spectral region from 2800 to 2850 cm−1 have been completed with a FT–IR spectrometer at a spectral resolution of 0.04 cm−1. This study confirms the results reported earlier by Kildal on the general shape of this absorption band. The absorption has been studied as a function of temperature, allowing a definite assignment to be made of the ground state features observed in this spectrum at room temperature. The ground state absorption to 3ν3 appears with a double Q branch [estimated band origins at 2830.22 and 2827.62 (±0.06) cm−1]. The intensities and temperature dependence studies confirm the assignment by Fox of these two Q branches to the two F1u components of the 3ν3 state.