University of Illinois Urbana-Champaign

PRECISION MEASUREMENTS OF WATER VAPOR SPECTROSCOPY BROADENED BY O₂ FOR ACCURATE DETERMINATION OF POTENTIAL ENERGY SURFACE

Sung, Keeyoon

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6993.pdf
WB05_1.pptx

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https://hdl.handle.net/2142/122518

Description

Title
PRECISION MEASUREMENTS OF WATER VAPOR SPECTROSCOPY BROADENED BY O₂ FOR ACCURATE DETERMINATION OF POTENTIAL ENERGY SURFACE
Author(s)
Sung, Keeyoon
Contributor(s)
  • Gamache, Robert R.
  • Toon, Geoffrey C.
Issue Date
2023-06-21
Keyword(s)
Linelists
Abstract
We have investigated collisional broadening and pressure-induced frequency shift for H₂O transitions broadened by O₂. For this, we have obtained one pure and four O₂-mixture spectra of H₂O in the ν₂ region at room temperature using a high-resolution Fourier transform spectrometer (Bruker IFS-125HR) at the Jet Propulsion Laboratory. Using a high-precision spectrum fitting package, Labfit, which adopted non-linear least squares curve fitting algorithm based on a Voigt line shape profile, we have retrieved the two line shape parameters as well as the line positions by fitting all the five spectra simultaneously. It should be noted, however, that their line intensities have been held to the HITRAN values, which improved the precision of the widths and shifts retrieval to a sub% level for most of the transitions. Results from this work have been used to improve the intermolecular potential of the collisional pair, H₂O-O₂, as part of the theoretical model calculations for O₂-broadened H₂O transitions. We will present and discuss the retrieval methodology and the impact of the measurement results on the theoretical model calculations, which are expected to produce more accurate line shape parameters for the entire rovibrational transitions of H₂O in the infrared.ᵃ
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/122518
DOI
https://doi.org/10.15278/isms.2023.6993

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Abstracts & Presentations - 2023 International Symposium on Molecular Spectroscopy PRIMARY