University of Illinois Urbana-Champaign

Updating Ch<sub>4</sub> Spectroscopic Models From 6770-7630 Cm<sup>&#8722;1</sup> With Dual Frequency Comb Absorption Spectroscopy Up To 1000 K

Yun, David

Content Files
5731.pdf
WF09_5731.pdf

Permalink

https://hdl.handle.net/2142/111523

Description

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
Issue Date
2021-06-23
Keyword(s)
Linelists
Date of Ingest
  • 2021-09-24T21:09:57Z
  • 2022-01-21T16:08:25Z
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.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Permalink
http://hdl.handle.net/2142/111523
DOI
10.15278/isms.2021.WF09

Owning Collections

Abstracts & Presentations - 2021 International Symposium on Molecular Spectroscopy PRIMARY