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Title: | Inelastic Collisions of N2, H2, and H2+He Mixtures in Supersonic Jets by Raman Spectroscopy |
Authors: | Fernández Sánchez, José María CSIC ORCID ; Fonfría, José Pablo CSIC ORCID; Ramos, Ángel CSIC; Tejeda, Guzmán CSIC ORCID; Montero, Salvador CSIC ORCID; Thibault, Franck | Keywords: | Inelastic molecular collisions Supersonic jets Raman spectroscopy Close-coupling calculations State-to-state rate coefficients |
Issue Date: | 31-Dec-2008 | Publisher: | American Institute of Physics | Citation: | AIP Conf. Proc. 1084: 571-576 (2008) | Abstract: | We 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. | Description: | 6 pages, 4 figures.-- PACS nrs: 31.70.Hq; 33.20.Fb; 34.50.Ez; 47.40.Ki; 47.45.Ab; 47.60.Kz. | Publisher version (URL): | http://dx.doi.org/10.1063/1.3076540 | URI: | http://hdl.handle.net/10261/12556 | DOI: | 10.1063/1.3076540 | ISSN: | 0094-243X |
Appears in Collections: | (CFMAC-IEM) Artículos |
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