University of Illinois Urbana-Champaign

STRONG THERMAL NONEQUILIBRIUM IN HYPERSONIC CO AND CH4 PROBED BY CRDS

Boudon, Vincent

Content Files
347916.pptx
948.pdf

Permalink

https://hdl.handle.net/2142/79070

Description

Title
STRONG THERMAL NONEQUILIBRIUM IN HYPERSONIC CO AND CH4 PROBED BY CRDS
Author(s)
Boudon, Vincent
Contributor(s)
  • Kassi, Samir
  • Rey, Michael
  • Georges, Robert
  • Suas-David, Nicolas
  • Louviot, Maud
Issue Date
25-Jun-15
Keyword(s)
Instrument/Technique Demonstration
Date of Ingest
2016-01-05T20:05:41Z
Abstract
A new experimental set-up coupling a High Enthalpy Source (HES) reaching 2000~K to a cw Cavity Ring-Down Spectrometer has been developed to investigate rotationnally cold hot bands of polyatomic molecules in the $[1.5,1.7]$~$mu$m region. The rotational and vibrational molecular degrees of freedom are strongly decoupled in the hypersonic expansion produced by the HES and probed by Cavity Ring-Down Spectroscopy. Carbon monoxide has been used as a first test molecule to validate the experimental approach. Its expansion in argon led to rotational and vibrational temperatures of $6.7pm 0.8$~K and $2006pm 476$~K, respectively. The Tetradecad polyad of methane ($1.67$~$mu$m) was investigated under similar conditions leading to rotational and vibrational temperatures of $13pm 5$~K and $750pm 100$~K, respectively. The rotationally cold structure of the spectra reveals many hot bands involving highly excited vibrational states of methane.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
English
Permalink
http://hdl.handle.net/2142/79070

Owning Collections

Abstracts & Presentations - 2015 International Symposium on Molecular Spectroscopy PRIMARY