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Résumé
To meet the challenges of high-resolution molecular spectroscopy, increasingly sophisticated spectroscopic techniques were developed. For a long time FTIR and laser-based spectroscopies were used for these studies. The recent development of dual-comb spectroscopy at high-resolution makes this technique a powerful tool for gas phase studies. We report on the use and characterization of the IRis-F1, a tabletop mid-infrared dual-comb spectrometer, in the newly developed step-sweep mode. The resolution of the wavenumber axis is increased by step-wise tuning (interleaving) and accurate measurement of the laser center wavelength and repetition frequency. Doppler limited measurements of N2O and CH4 reveal a wavenumber accuracy of 10−4 cm−1 on the covered range of > 50 cm−1. Measured half-widths of absorption lines show no systematic broadening, indicating a negligible instrument response function. Finally, measurements of nitrogen pressure broadening coefficients in the ν4 band of methane show that quantum cascade laser dual-comb spectroscopy in step-sweep mode is well adapted for measurements of precision spectroscopic data, in particular line shape parameters.
langue originale | Anglais |
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Numéro d'article | 108239 |
Pages (de - à) | 108239 |
journal | Journal of Quantitative Spectroscopy and Radiative Transfer |
Volume | 287 |
Les DOIs | |
Etat de la publication | Publié - sept. 2022 |
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Examiner les sujets de recherche de « A mid-infrared dual-comb spectrometer in step-sweep mode for high-resolution molecular spectroscopy ». Ensemble, ils forment une empreinte digitale unique.Projets
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Etude expérimental et théorique des paramètres collisionnels et de leurs dépendances en température de raies d’absorption infrarouge pour des molécules d’intérêt atmosphérique
Vispoel, B. (Responsable du Projet) & Lepere, M. (Promoteur)
1/10/21 → 30/09/24
Projet: Recherche
Équipement
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Optique, Lasers et spectroscopies
Lepere, M. (!!Manager)
Plateforme technologique Lasers, optiques et spectroscopiesEquipement/installations: Plateforme technolgique