Nitrogen broadening of SF6 transitions in the nu3 band

Robert R. Gamache (1) , Nelly Lacome (2) , Pierre Gérard (3) , Tony Gabard (3)

1 Department of Environmental, Earth, and Atmospheric Sciences [Lowell]
2 LADIR - Laboratoire de Dynamique Interactions et Réactivité
3 LPUB - Laboratoire de Physique de l'Université de Bourgogne

Nitrogen induced pressure-broadened halfwidths of a number of nu3 transitions of SF6 are calculated using the complex Robert-Bonamy (CRB) formalism. The calculations are made at 200, 250, 296 and 350 K and the temperature dependence of the halfwidths are determined. The intermolecular potential is taken as a sum of the leading electrostatic and Lennard-Jones [6-12] atom-atom components. The dynamics of the collision process are correct to second order in time. The calculated halfwidths are used to simulate the nu3 spectrum, which is compared to a simulation made using the HITRAN96 halfwidths and measurements made at the Université Pierre et Marie Curie. It is shown that simulations made using the halfwidths calculated in this work are in better agreement with the measurements.

Mots clés: Sulfur hexafluoride; Halfwidths; Line broadening; Temperature dependence of the halfwidth

Domaines: Physique Quantique [quant-ph]

Robert R. Gamache, Nelly Lacome, Pierre Gérard, Tony Gabard. Nitrogen broadening of SF6 transitions in the nu3 band. Journal of Molecular Structure, 2001, 599 (1-3), pp.279-292. ⟨10.1016/S0022-2860(01)00831-6⟩. ⟨hal-01053639⟩