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Inelastic Collisions of N2, H2, and H2+He Mixtures in Supersonic Jets by Raman Spectroscopy

AuthorsFernández Sánchez, José María CSIC ORCID ; Fonfría, José Pablo CSIC ORCID; Ramos, Ángel CSIC; Tejeda, Guzmán CSIC ORCID; Montero, Salvador CSIC ORCID; Thibault, Franck
KeywordsInelastic molecular collisions
Supersonic jets
Raman spectroscopy
Close-coupling calculations
State-to-state rate coefficients
Issue Date31-Dec-2008
PublisherAmerican Institute of Physics
CitationAIP Conf. Proc. 1084: 571-576 (2008)
AbstractWe present a detailed study of inelastic collisions at low temperature in several supersonic jets of N2, H2, and H2+He mixtures using different nozzles and stagnation conditions. Absolute number density and rotational population data of unprecedented accuracy are measured along the jet axis by Raman spectroscopy with high spatial resolution (<5μm) and high-sensitivity (<1 photon/sec). The experimental data are interpreted by means of a master ecuation describing the time evolution of the rotational populations in terms of the state-to-state rate coefficients derived from high-level quantum calculations. This combination of experimental and calculated data leads to a detailed understanding of the underlying physics, consistent with the assumed isentropic behaviour. The breakdown of rotational-translational thermal equilibrium, and its space-time evolution along the jet axis are accounted for by the microscopic (state-to-state rate coefficients) and macroscopic (flow velocity, number density, temperatures) physical quantities. A highly consistent picture, free from any additional parameters, bridges this way the microscopic and macroscopic approaches to fluid dynamics along the jet axis.
Description6 pages, 4 figures.-- PACS nrs: 31.70.Hq; 33.20.Fb; 34.50.Ez; 47.40.Ki; 47.45.Ab; 47.60.Kz.
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