New experimental measurements of the H2-CO2 Collision-Induced Absorption in the [3907-4770] cm−1 spectral range from 241 to 498 K
Abstract
The collision-induced absorption (CIA) of a H2-CO2 mixture has been studied in the [3907, 4770] cm−1 spectral range for temperatures ranging from 241 to 498 K. The experiments were based on the use of a new high-resolution Fourier spectrometer coupled with an atmospheric simulation chamber. Binary absorption coefficients (BACs) were measured for the first time in the [4033, 4730] cm−1 spectral range at temperatures other than room temperature and are provided in tabular form. At room temperature, the results are compared with existing experimental data and theoretical coefficients, while for the other temperatures, only theoretical values are available. For all considered temperatures, we computed the theoretical integrated band intensity for the experimental BACs and the semi-empirical models. The calculations have been made over the reduced [4033, 4730] cm−1 spectral range, and the entire band, in order to explore the bias induced by using a restricted spectral region. Furthermore, the H2-CO2 BACs were compared with the previously measured H2-H2 and H2-He data. We observed an overall higher absorption of the H2-CO2 BACs, with scaling factors ranging from six to sixteen with respect to the H2-H2 BACs, and from nine to twenty-seven for the H2-He case, depending on the spectral region. Finally, we used an empirical approach, to parametrize the BACs using an exponential profile as a function of temperature, using a series of wavenumber-dependent coefficients, an. These coefficients allow to interpolate the BACs in the temperature range covered by the measurements.
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BibTeX
@article{vitali2026experimental,
title = {{New experimental measurements of the H2-CO2 Collision-Induced Absorption in the [3907-4770] cm−1 spectral range from 241 to 498 K}},
author = {F. Vitali and S. Stefani and G. Piccioni and H. Tran and M. Snels and D. Grassi and C. Boulet and D. Biondi and A. Boccaccini},
journal = {Icarus},
year = {2026},
month = oct,
doi = {10.1016/j.icarus.2026.117103},
url = {https://hal.sorbonne-universite.fr/hal-05840792v1},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - New experimental measurements of the H2-CO2 Collision-Induced Absorption in the [3907-4770] cm−1 spectral range from 241 to 498 K
AU - F. Vitali
AU - S. Stefani
AU - G. Piccioni
AU - H. Tran
AU - M. Snels
AU - D. Grassi
AU - C. Boulet
AU - D. Biondi
AU - A. Boccaccini
PY - 2026
DA - 2026/10/27
JO - Icarus
DO - 10.1016/j.icarus.2026.117103
UR - https://hal.sorbonne-universite.fr/hal-05840792v1
AB - The collision-induced absorption (CIA) of a H2-CO2 mixture has been studied in the [3907, 4770] cm−1 spectral range for temperatures ranging from 241 to 498 K. The experiments were based on the use of a new high-resolution Fourier spectrometer coupled with an atmospheric simulation chamber. Binary absorption coefficients (BACs) were measured for the first time in the [4033, 4730] cm−1 spectral range at temperatures other than room temperature and are provided in tabular form. At room temperature, the results are compared with existing experimental data and theoretical coefficients, while for the other temperatures, only theoretical values are available. For all considered temperatures, we computed the theoretical integrated band intensity for the experimental BACs and the semi-empirical models. The calculations have been made over the reduced [4033, 4730] cm−1 spectral range, and the entire band, in order to explore the bias induced by using a restricted spectral region. Furthermore, the H2-CO2 BACs were compared with the previously measured H2-H2 and H2-He data. We observed an overall higher absorption of the H2-CO2 BACs, with scaling factors ranging from six to sixteen with respect to the H2-H2 BACs, and from nine to twenty-seven for the H2-He case, depending on the spectral region. Finally, we used an empirical approach, to parametrize the BACs using an exponential profile as a function of temperature, using a series of wavenumber-dependent coefficients, an. These coefficients allow to interpolate the BACs in the temperature range covered by the measurements.
SN - 0019-1035
SN - 1090-2643
ER -