6533b7d4fe1ef96bd1262698

RESEARCH PRODUCT

High-resolution FTIR spectrum and analysis of the ν2+ν4 combination band of 32SF6

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Abstract The spectroscopic knowledge of sulfur hexafluoride, which is necessary for a correct remote sensing and monitoring of this species in the Earth’s atmosphere, is still very partial. In particular, the hot bands in the strongly absorbing ν 3 region (near 948 cm −1 ) have not been analyzed yet. Their study implies the analysis of many vibrational levels and thus the spectroscopy of various fundamental, harmonic, and combination bands. The present work is a new contribution to this topic, concerning the ν 2 + ν 4 combination band. The FTIR spectrum of this region has been recorded at room temperature with a resolution of 0.002 cm −1 . The data have been analyzed thanks to the HTDS software ( http://www.u-bourgogne.fr/LPUB/shTDS.html ) developed in Dijon for XY 6 octahedral molecules. Seven hundred and fifty-nine lines could be assigned up to J =112, and the standard deviation is 0.0022 cm −1 . The distance between the two vibrational sublevels with respective symmetry F 1 u and F 2 u is 0.348 cm −1 .