Application Of Theoretical Constraints To Model The Measured Temperature And Wavelength Dependence Of Collision-induced Absorption In The 0.76 Μm And 1.27 Μm O2 Bands

Adkins, Erin M.

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https://hdl.handle.net/2142/116648 Copy

Description

Title

Application Of Theoretical Constraints To Model The Measured Temperature And Wavelength Dependence Of Collision-induced Absorption In The 0.76 Μm And 1.27 Μm O2 Bands

Author(s)

Adkins, Erin M.

Contributor(s)

• Hodges, Joseph T.
• Mondelain, Didier
• Campargue, Alain
• Long, David A.
• Karman, Tijs
• Fleurbaey, Helene

Issue Date

2022-06-24

Keyword(s)

Lineshapes, collisional effects

Abstract

Understanding collision-induced absorption (CIA) is a critical component to improving the \chem{O_2} spectroscopy for remote sensing applications. Traditionally in experimental spectra, CIA is defined as the remaining absorption after accounting for the baseline, Rayleigh scattering, and resonant absorption. This approach can present difficulties in systems, like the \chem{O_2} A-Band at 0.76 $\mu$m, where the CIA is relatively weak and is highly correlated with the line-mixing model. Theoretical constraints on the magnitude and shape of the CIA could aid in decoupling the resonant and broadband features ultimately leading to an improved spectroscopic model. The CIA model reported by Karman et al. [1] provides a theoretical basis for the CIA in the 1.27 $\mu$m and 0.76 $\mu$m \chem{O_2} bands [1]. In this work, we evaluate the theoretical model using cavity ring-down spectroscopy measurements collected at multiple temperatures in both the 1.27 $\mu$m [2-4] and 0.76 $\mu$m \chem{O_2} bands. In addition to a qualitative comparison between experiment and theory, this work explores parameterization of the CIA model reported by Karman et al. [1] for future inclusion in integrated multi-spectrum analyses incorporating advanced line shape models, line-mixing, and CIA. [1] Karman T, et al. Nature Chemistry. 2018;10:549-54. [2] Kassi S, et al. Journal of Geophysical Research: Atmospheres. 2021;126. [3] Mondelain D, et al. Journal of Geophysical Research: Atmospheres. 2019;124:414-23. [4] Fleurbaey H, et al. Journal of Quantitative Spectroscopy and Radiative Transfer. 2021;270.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116648

DOI

https://doi.org/10.15278/isms.2022.FE05

Copyright and License Information

Copyright 2022 held by the authors

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