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CO2 collision-induced line parameters for the ν3 band of 12CH4 measured using a hard-collision speed-dependent line shape and the relaxation matrix formalism

par Bertin, Thibault ;Vander Auwera, Jean
Référence Journal of quantitative spectroscopy & radiative transfer, 324, 109069
Publication Publié, 2024-09-01

Article révisé par les pairs

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Résumé :

Ten high resolution Fourier transform spectra of the pentad region near 3.3μm of methane diluted in carbon dioxide at total pressures up to 800 hPa have been recorded at 296.5(5) K. Including a high resolution spectrum of pure methane at low pressure, these spectra have been analyzed using multi-spectrum fitting techniques. The methane lines were modeled using hard-collision speed-dependent line profiles and line mixing was included in the strongest absorption regions, considering the first order Rosenkranz approximation and the relaxation matrix formalism. CO2 broadening and shift coefficients have been measured, together with the speed dependence of broadening. Results obtained using the two line mixing models are intercompared and compared with previous work.