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Article Dans Une Revue Journal of Quantitative Spectroscopy and Radiative Transfer Année : 2024

Jet-cooled ethylene cavity ring-down spectroscopy between 5880 and 6200 cm−1

Résumé

Absorption spectra of jet-cooled ethylene (ethene, C2H4) are recorded at three different rotational temperatures (6/8 K, 12 K, 38 K) using cavity ring-down spectroscopy (CRDS) in the 5880-6200 cm−1 spectral region. Rotational cooling is used to determine the various vibrational band centers by simplifying drastically the rotational band structure. A line-by-line assignment, based on a direct comparison with the TheoReTS variational line list and a systematic use of lower state combination difference (LSCD), is performed. Experimental line lists including line position and line integrated absorption cross sections are drawn up. The 6/8 K, 12 K and 38 K spectra contain 668, 1553 and 1679 absorption lines respectively. Overall, 320 rovibrational lines are assigned across 20 interacting vibrational bands. Among the 20 vibrational cold bands identified in this work, 14 had never been observed before. Line intensities are in the range of 10−24 - 10−20 cm/molecule. A direct comparison between our work and the TheoReTS and ExoMol theoretical line lists, as well as with the recent experimental work of Ben Fathallah et al. 2024 is provided.
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lundi 2 décembre 2024
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Avant la publication
lundi 2 décembre 2024
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lundi 2 décembre 2024
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hal-04600006 , version 1 (04-07-2024)

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Solène Perot, Julien Lecomte, Nicolas Suas-David, Lucile Rutkowski, Michael M. Rey, et al.. Jet-cooled ethylene cavity ring-down spectroscopy between 5880 and 6200 cm−1. Journal of Quantitative Spectroscopy and Radiative Transfer, 2024, 324, pp.109065. ⟨10.1016/j.jqsrt.2024.109065⟩. ⟨hal-04600006⟩
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