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 Title: HYPERSONIC POST-SHOCK CAVITY RING-DOWN SPECTROSCOPY Author(s): Suas-David, Nicolas Contributor(s): Georges, Robert; Benidar, Abdessamad; Kassi, Samir Subject(s): Linelists Abstract: A highly sensitive experimental set-up ($alpha$$_{min}$ = 10$^{-10}$ cm$^{-1}$) has been developed to produce high-temperature infrared spectra of methane in the Tetradecad polyad region (1.67 $mu$m) using cw-CRDS. A continuous flow of methane admixed to argon is initially heated at 1000 � 1500 K and then accelerated to hypersonic speeds in a vacuum chamber before being abruptly stopped by the impact on a planar screen set perpendicular to the flow axis, forming a stationary shock wave detached from the screen (bow shock). The CRD optical beam probes the very hot subsonic zone behind the shock where the gas temperature is close to the stagnation one. Computational Fluid Dynamics calculations have been performed to characterize the post-shock structure of the flow. Spectra reveal a series of new hot bands of fundamental interest for the modeling of highly excited levels of methane. Issue Date: 22-Jun-15 Publisher: International Symposium on Molecular Spectroscopy Citation Info: ACS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/79197 Date Available in IDEALS: 2016-01-05
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