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Article Dans Une Revue Journal of Quantitative Spectroscopy and Radiative Transfer Année : 2022

Collisional line-shape effects in accurate He-perturbed H-2 spectra

Roman Ciurylo
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Franck Thibault

Résumé

We investigate collisional line-shape effects that are present in highly accurate experimental spectra of the 3-0 S(1) and 2-0 Q(1) molecular hydrogen absorption lines perturbed by helium. We clearly distin-guish the influence of six different collisional effects (i.e.: collisional broadening and shift, their speed dependencies and the complex Dicke effect) on the shapes of H-2 lines. We demonstrate that only a very specific combination of these six contributions, determined from our ab initio calculations, gives unprece-dentedly good agreement with experimental spectra. If any of the six contributions is neglected, then the experiment-theory comparison deteriorates at least several times. We also analyze the influence of the centrifugal distortion on our ab initio calculations and we demonstrate that the inclusion of this effect slightly improves the agreement with the experimental spectra. (C) 2021 The Author(s). Published by Elsevier Ltd.
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Origine : Publication financée par une institution

Dates et versions

hal-03413859 , version 1 (30-05-2022)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Michal Slowinski, Hubert Jozwiak, Maciej Gancewski, Kamil Stankiewicz, Nikodem Stolarczyk, et al.. Collisional line-shape effects in accurate He-perturbed H-2 spectra. Journal of Quantitative Spectroscopy and Radiative Transfer, 2022, 277, pp.107951. ⟨10.1016/j.jqsrt.2021.107951⟩. ⟨hal-03413859⟩
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