Measurements of H2O broadened by CO2 line-shape parameters: Beyond the Voigt profile

Ducreux, B. Grouiez, S. Robert, M. Lepère, B. Vispoel, R. R. Gamache, L. Régalia

Research output: Contribution to journalReview articlepeer-review


H2O is an important molecule in the quest to better understand the evolution of solar system. In the study of Venus and Mars CO2-rich atmospheres (around 96 % of their composition) and because of the space instruments constant improvements, the planetary community needs spectroscopic data as accurate as possible. Continuing from our previous study [JQSRT 231, 126(2019)], new spectra of H2O perturbed by CO2 were measured with our new experimental set-up in the 2.7 µm region to compare with the previous results. After the improvement in the determination of the partial pressure of water vapor, the line parameters were then determined with a multispectrum fitting procedure using a Voigt profile in the same way as in [JQSRT 231, 126(2019)]. This led to characteristic W-shape residuals that have been improved using beyond-Voigt profiles. Our investigation showed that considering the speed dependence of collisional line parameters is essential to obtain better line-shape parameters in the considered experimental conditions.

Original languageEnglish
Article number109026
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Publication statusPublished - Sept 2024


  • Carbon dioxide
  • High resolution infrared spectroscopy
  • Line profiles
  • Line shape parameters
  • Planetary atmospheres
  • Water vapor


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