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Title:Updating Ch4 Spectroscopic Models From 6770-7630 Cm−1 With Dual Frequency Comb Absorption Spectroscopy Up To 1000 K
Author(s):Yun, David
Contributor(s):Rieker, Gregory B; Drouin, Brian; Coburn, Sean; Egbert, Scott C; Sung, Keeyoon; Malarich, Nathan A
Abstract:\begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.5]{ISMS_figure99.eps} \end{wrapfigure} Accurate high-temperature methane spectroscopic models are needed to support the discovery and evaluation of methane in hot exoplanet atmospheres. We present data taken with dual frequency comb absorption spectroscopy with a 0.0067 cm$^{-1}$ frequency point spacing of the methane icosad (6770-7630 cm$^{-1}$) of five temperatures up to 1000 K and three pressures up to 300 torr. A comparison of this data to HITRAN2016, HITEMP2020, and ExoMol reveals a best match with HITRAN2016 at room temperatures. However, there are significant mismatches with all three databases at elevated temperatures. Via a multispectrum fitting routine, we demonstrate that significant improvements can be made between HITRAN2016 high-temperature models and our data by updating several spectroscopic parameters. In particular, we update 4381 lower state energies, add 293 new hot absorption features, and apply band-wide changes to line-positions, self-widths, and temperature-dependence exponents for self-widths and self-shifts.
Issue Date:2021-06-23
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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