6533b82dfe1ef96bd1290824

RESEARCH PRODUCT

Observation and analysis of the SF6 ν2+ν4−ν5 band: Improved parameters for the v5= 1 state

subject

description

Abstract In this paper, we present the high resolution analysis of the weak ν 2 + ν 4 - ν 5 band of SF6 around 735 cm−1. The spectra were recorded on the AILES Beamline at the SOLEIL Synchrotron facility using a cryogenic multipass cell coupled to a Bruker 125HR spectrometer with a maximum resolution of 0.00102 cm−1. For this band, we worked with 4 mbar of SF6 at a temperature of 223 ± 2  K. The optical path length was fixed to 141 m and the spectrum recorded with 0.001 cm−1 of resolution. A new, cold spectrum of the ν 2 + ν 4 band was also collected at 153 K, 15-m path length, and 0.0015 cm−1 resolution. The analysis was performed by using the Dijon group XTDS and SPVIEW software, based on tensorial formalism. We achieved correct simulation and line position assignments of the ν 2 + ν 4 - ν 5 band, by gathering ν 2 + ν 4 data and ν 5 Raman data. We could assign 3553 transition for ν 2 + ν 4 - ν 5 with a standard deviation of 1.292 × 10 - 3  cm−1. This analysis also helped improve the v2 = v4 = 1 level and the v5 = 1 fundamental level v2 = v4 = 1.