Measurements and calculations of ethylene line-broadening by argon in the ν₇ band at room temperature

Linh Nguyen (1) , Ghislain Blanquet (1) , Jeanna Buldyreva (2) , Muriel Lepère (1)

1 Physics - LLS
2 UTINAM - Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213)

Argon broadening coefficients are measured for 32 vibrotational lines in the ν₇ band of ethylene at room temperature using a tunable diode-laser spectrometer. These lines with 3≤ J ≤ 19, 0≤ K_a ≤ 4, 2 ≤ K_c ≤ 19 in the P, Q and R branches are located in the spectral range 919-1023 cm^-1. The fitting of experimental line shapes with Rautian profile provides the collisional widths slightly larger than those derived from Voigt profile. The independent theoretical estimation of these line widths is performed by a semiclassical approach of Robert-and-Bonamy type with exact isotropic trajectories generalized to asymmetric tops. Even with a rough atom-atom intermolecular potential model the calculated values show a quite good agreement with experimental results.

Mots clés: Physical Sciences

Linh Nguyen, Ghislain Blanquet, Jeanna Buldyreva, Muriel Lepère. Measurements and calculations of ethylene line-broadening by argon in the ν₇ band at room temperature. Molecular Physics, 2008, 106 (07), pp.873-880. ⟨10.1080/00268970802001355⟩. ⟨hal-00513182⟩