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

Sung, Keeyoon

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

Description

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

Language

eng

Handle URL

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

DOI

https://doi.org/10.15278/isms.2023.6992

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