Mid-infrared high-resolution dual-comb spectroscopy: Intensity, broadening, and beyond-Voigt parameters of 12C2H2 and 13C12CH2 lines

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Résumé

Using a high-resolution mid-infrared dual-comb spectrometer operating in the 1300 cm−1 spectral region, spectra of acetylene were recorded at room temperature. Spectroscopic parameters were measured in 3 vibrational bands of both 12C2H2 and 13C12CH2. Absolute line intensities (S0) and self-broadening coefficients (γ0self) were determined in the ν45, 2ν425−1⟵ν41 and ν41+2ν50⟵ν51 bands. For the main isotopologue, the collisional narrowing coefficients (ν0VC) as well as the speed-dependence of the broadening (γ2) and shifting (δ2) coefficients were measured in the ν45 band of the main isotopologue of acetylene. Theoretical line-shape models were fitted on experimental profiles using a homemade multi-spectrum fitting procedure to determine spectroscopic parameters. Excellent agreement with the literature was found for self-broadening coefficients and absolute line intensities in the ν45 band of 12C2H2. For the hot bands, good agreement with the literature is found within experimental uncertainties, while γ0self of those hot bands are also reported for the first time. Similarly, the rotational dependence of ν0VC is found to be close to previous works. γ2 and δ2 of 12C2H2, as well as S0 and γ0self of 13C12CH2 are also reported for the first time in this band.

langue originaleAnglais
Numéro d'article109149
journalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume328
Les DOIs
Etat de la publicationPublié - déc. 2024
Modification externeOui

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