The binary absorption coefficients for H 2 +CO 2 mixtures in the 2.12-2.35 µm spectral region determined by CRDS and by semi-empirical calculations

• Published in: Journal of quantitative spectroscopy & radiative transfer Vol. 260
• Main Authors: Mondelain, Didier, Boulet, C., Hartmann, J.-M.
• Format: Journal Article
• Language: English
• Published: Elsevier 2021
• Subjects: Atmospheric and Oceanic Physics; Chemical Sciences; or physical chemistry; Physics; Theoretical and
• ISSN: 0022-4073
• DOI: 10.1016/j.jqsrt.2020.107454

Spectra of CO 2 +H 2 mixtures have been recorded at room temperature by using the cavity ring down technique, for four spectral intervals in the 2.12-2.35 µm CO 2 spectral window which is within the (1-0) band of H 2. The binary coefficients + have been retrieved from the spectra recorded at different pressures after subtraction of the CO 2 monomer contribution and of the H 2-H 2 and CO 2-CO 2 collision induced absorptions (CIAs). In order to reduce the uncertainties, new measurement of the pure H 2 CIA, the main subtracted contribution, at the percent level are also reported. The new set of experimental binary coefficients is compared to values provided by semiempirical calculations made with the assumption of an isotropic CO 2-H 2 interaction potential and neglecting the short interaction-range induced electric dipole. This comparison shows the limits of using such a model, which is the only one available, in that spectral region.