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Air-broadening in near-infrared carbon dioxide line shapes: quantifying contributions from O2, N2, and Ar

Published

Author(s)

Erin Adkins, David Long, Joseph T. Hodges

Abstract

We measured air broadening in the (30012) ← (00001) carbon dioxide (CO2) band up to Jʺ = 50 using frequency-agile rapid scanning cavity ring-down spectroscopy. By using synthetic air samples with varying levels of nitrogen, oxygen, and argon, multi-spectrum fitting allowed for the collisional broadening terms of each major air component to be simultaneously determined in addition to advanced line shape parameters at atmospherically relevant CO2 mixing ratios. These values were compared to broadener-specific line shape parameters from the literature. Fits to measured spectra were also constrained with results from requantized classical molecular dynamic simulations. We show that this approach enables differentiation between narrowing mechanisms in advanced line shape parameters retrieved from experimental spectra of limited signal-to-noise ratio.
Citation
Journal of Quantitative Spectroscopy and Radiative Transfer

Citation

Adkins, E. , Long, D. and Hodges, J. (2021), Air-broadening in near-infrared carbon dioxide line shapes: quantifying contributions from O2, N2, and Ar, Journal of Quantitative Spectroscopy and Radiative Transfer, [online], https://doi.org/10.1016/j.jqsrt.2021.107669, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=931858 (Accessed May 22, 2024)

Issues

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Created April 19, 2021, Updated November 29, 2022