First-principles calculations of far-wing absorption in He-broadened CO2 infrared spectra
Abstract
We report theoretical predictions and modeling of the far-wing absorption of CO2 broadened by He over a wide temperature range (200-1000 K), which are relevant for exoplanet atmosphere studies. Accurate modeling of He-broadened CO2 absorption is essential for opacity calculations used to characterize the composition, structure, and climate of exoplanet atmospheres. In particular, the strong CO2 band at 4.3 mum has been clearly identified in the spectra of several exoplanets observed with the James Webb Space Telescope (JWST). Requantized classical molecular dynamics simulations were first performed to predict absorption in the far wings of the 4.3 mum band of CO2. The resulting predictions show excellent agreement with available experimental data at room temperature. The theoretical predictions and measured data were then used to parameterize an impact energy-corrected sudden model, which allowed us to accurately reproduce the far-wing absorption of He-broadened CO2 in several infrared spectral regions over the (200-1000) K temperature range. Finally, for applications to exoplanet atmosphere opacity calculations, we derived temperature-dependent chi-factor corrections that account for the sub-Lorentzian behavior of the far wing of the major infrared bands of CO2.
Versions
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BibTeX
@misc{tran2026firstprinciples,
title = {{First-principles calculations of far-wing absorption in He-broadened CO2 infrared spectra}},
author = {Ha Tran and Emile Ducreux},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.00188},
eprint = {2611.00188},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.00188},
}
RIS
TY - UNPB
TI - First-principles calculations of far-wing absorption in He-broadened CO2 infrared spectra
AU - Ha Tran
AU - Emile Ducreux
PY - 2026
DA - 2026/11/01
PB - arXiv
DO - 10.48550/arxiv.2611.00188
UR - https://arxiv.org/abs/2611.00188
AB - We report theoretical predictions and modeling of the far-wing absorption of CO2 broadened by He over a wide temperature range (200-1000 K), which are relevant for exoplanet atmosphere studies. Accurate modeling of He-broadened CO2 absorption is essential for opacity calculations used to characterize the composition, structure, and climate of exoplanet atmospheres. In particular, the strong CO2 band at 4.3 mum has been clearly identified in the spectra of several exoplanets observed with the James Webb Space Telescope (JWST). Requantized classical molecular dynamics simulations were first performed to predict absorption in the far wings of the 4.3 mum band of CO2. The resulting predictions show excellent agreement with available experimental data at room temperature. The theoretical predictions and measured data were then used to parameterize an impact energy-corrected sudden model, which allowed us to accurately reproduce the far-wing absorption of He-broadened CO2 in several infrared spectral regions over the (200-1000) K temperature range. Finally, for applications to exoplanet atmosphere opacity calculations, we derived temperature-dependent chi-factor corrections that account for the sub-Lorentzian behavior of the far wing of the major infrared bands of CO2.
ER -