Self and N2 collisional broadening of far-infrared methane lines at low-temperature with application to Titan - Université de Bourgogne Accéder directement au contenu
Article Dans Une Revue Icarus Année : 2023

Self and N2 collisional broadening of far-infrared methane lines at low-temperature with application to Titan

Résumé

We report the measurement of broadening coefficients of pure rotational lines of methane at different pressure and temperature conditions. A total of 27 far-infrared spectra were recorded at the AILES beamline of the SOLEIL synchrotron at room-temperature, 200 K and 120 K, in a range of 10 to 800 mbar. Self and N 2 broadening coefficients and temperature dependence exponents of methane pure rotational lines have been measured in the 73-136 cm −1 spectral range using multi-spectrum non-linear least squares fitting of Voigt profiles. These coefficients were used to model spectra of Titan that were compared to a selection of equatorial Cassini/CIRS spectra, showing a good agreement for a stratospheric methane mole fraction of (1.17 ± 0.08)%.
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Dates et versions

hal-04143516 , version 1 (29-06-2023)

Identifiants

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C. Richard, V. Boudon, L. Manceron, J. Vander Auwera, S. Vinatier, et al.. Self and N2 collisional broadening of far-infrared methane lines at low-temperature with application to Titan. Icarus, In press, pp.115692. ⟨10.1016/j.icarus.2023.115692⟩. ⟨hal-04143516⟩
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