Analysis of the rotationally-resolved 3.3 µm region of C2H4 in natural isotopic abundance - Université de Bourgogne Accéder directement au contenu
Article Dans Une Revue Journal of Quantitative Spectroscopy and Radiative Transfer Année : 2024

Analysis of the rotationally-resolved 3.3 µm region of C2H4 in natural isotopic abundance

Résumé

Ethylene (or ethene) is a natural gas compound present in our atmosphere but also in the atmospheres of outer solar system planets such as Jupiter, Saturn, Uranus, Neptune and Saturn’s moon Titan. However, a better knowledge of spectroscopic parameters is needed for this molecule in order to detect its presence and/or to derive its accurate concentration. We present here a detailed analysis and modeling of the strongly absorbing ν9 and ν11 fundamental bands in the 3.3 µm region. Due to the complexity of the observed spectrum, we have built a polyad scheme taking into account some fundamental bands previously analyzed thanks to the tensorial formalism developed in Dijon for asymmetric-top molecules. A four polyad system has been settled and the last P3 polyad contains five vibrational states: ν9, ν11, ν2 + ν12 and 2ν10 + ν12. A first frequency analysis has been performed, leading to 3328 assignments with a root mean square of 5.927 ´10−3 cm−1 and a standard deviation of 1.965 using 88 adjusted parameters, and we have also adjusted line intensities of 2190 lines by adjusting 14 parameters with an overall Root-Mean-Square (RMS) deviation of about 3.77%. A new linelist of calculated lines in the 2900 − 3300 cm−1 region has been added to the ECaSDa and we plan to integrate it to t h e HITRAN database.
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Dates et versions

hal-04536820 , version 1 (08-04-2024)

Identifiants

  • HAL Id : hal-04536820 , version 1

Citer

O. Ben Fathallah, Jean Vander Auwera, M. Tudorie, Vincent Boudon, Cyril Richard, et al.. Analysis of the rotationally-resolved 3.3 µm region of C2H4 in natural isotopic abundance. Journal of Quantitative Spectroscopy and Radiative Transfer, In press. ⟨hal-04536820⟩
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