University of Illinois Urbana-Champaign

PSEUDOLINE GENERATION FOR TRANS-2-BUTENE IN THE 7-15 μM REGION IN SUPPORT OF TITAN ATMOSPHERE STUDY

Sung, Keeyoon

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6992.pdf
RL06_1.pptx

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https://hdl.handle.net/2142/122517

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Title
PSEUDOLINE GENERATION FOR TRANS-2-BUTENE IN THE 7-15 μM REGION IN SUPPORT OF TITAN ATMOSPHERE STUDY
Author(s)
Sung, Keeyoon
Contributor(s)
  • Nixon, Conor A
  • Toon, Geoffrey C.
  • Lopes, Rosaly M
  • Malaska, Michael
  • Steffens, Brendan
Issue Date
2023-06-22
Keyword(s)
Mini-symposium: Infrared Spectroscopy in the JWST Era
Abstract
Butene (C₄H₈) is one of many C₄-hydrocarbons predicted to be up to 10 ppb in Titan’s atmosphere by photochemical models, but yet to be detected most likely due to lack of reliable high-resolution spectroscopy, particularly at cold temperatures. As a continued work on high-resolution spectroscopy of trans-2-Butene (trans-2-C₄H₈: CH₃-CH=CH-CH₃), we present the pseudoline generation made from the same spectrum data sets in the 7 - 15 µm region (See F09 in the ISMS 2022). In total, 28 pure and N₂-mixture spectra were obtained at temperatures between 180 – 297 K using a Fourier transform spectrometer (Bruker IFS-125HR). All the spectra were fit together to derive a single set of pseudoline parameters, which includes line intensity and lower-state energy value at individual frequency bins that are considered as pseudoline positions. The pseudolines are found to reproduce the observed spectra via line-by-line radiative transfer calculations to within a few % across the spectral region. We have the pseudoline list compiled in a HITRAN database format to facilitate their implementation into existing radiative transfer codes, which use the HITRAN database for other molecules. We will present and discuss the results and performance of the pseudolines. It is anticipated that the results from this work will provide critical laboratory input toward a search for trans-2-Butene in Titan stratosphere that may be captured in the Cassini/CIRS spectra, or in future space-based (MIRI/JWST) and ground-based observations (e.g., TEXES/IRTF).
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/122517
DOI
https://doi.org/10.15278/isms.2023.6992

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Abstracts & Presentations - 2023 International Symposium on Molecular Spectroscopy PRIMARY