University of Illinois Urbana-Champaign

MID-INFRARED DOPPLER-FREE SATURATION ABSORPTION SPECTROSCOPY OF THE Q BRANCH OF CH4 ν3=1 BAND USING A RAPID-SCANNING CONTINUOUS-WAVE OPTICAL PARAMETRIC OSCILLATOR

Riyadh, S M Shah

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7154.pdf
RL10_1.pptx

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https://hdl.handle.net/2142/122638

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Title
MID-INFRARED DOPPLER-FREE SATURATION ABSORPTION SPECTROSCOPY OF THE Q BRANCH OF CH4 ν3=1 BAND USING A RAPID-SCANNING CONTINUOUS-WAVE OPTICAL PARAMETRIC OSCILLATOR
Author(s)
Riyadh, S M Shah
Contributor(s)
  • Liu, Jinjun
  • Hu, Shui-Ming
  • Cheng, Cunfeng
  • Foote, David B.
  • Bersson, Jonathan Swift
  • Jones, Ian
  • Telfah, Hamzeh
Issue Date
2023-06-22
Keyword(s)
Mini-symposium: Infrared Spectroscopy in the JWST Era
Abstract
We have developed a mid-infrared Doppler-free saturation absorption spectroscopy apparatus using a continuous-wave optical parametric oscillator (CW-OPO). Here we report a comprehensive spectral scan of the Q branch transitions of the ν₃=1 band of methane (CH₄) with an average linewidth (FWHM) of 4.5 MHz. The absolute frequency calibration was achieved using previously reported transition frequencies determined using optical frequency combs, while an etalon was used for relative frequency calibration. We report 12 transitions with improved accuracies of ~3 MHz. These measurements are then used to lock to a single transition, which then can be used to access the higher polyads with a second photon via a transition that is measured through CW-CRDS.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/122638
DOI
https://doi.org/10.15278/isms.2023.7154

Owning Collections

Abstracts & Presentations - 2023 International Symposium on Molecular Spectroscopy PRIMARY