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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
Subject(s):Instrument/Technique Demonstration
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.
Issue Date:25-Jun-15
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:ACS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/79070
Date Available in IDEALS:2016-01-05


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