Collisional broadening and shifting parameters of the RamanQbranch ofH2perturbed byN2determined from speed-dependent line profiles at high temperatures

Autor:	J.P. Berger, X. Michaut, R. Chaux, D. Robert, Jeanine Bonamy, Hubert Berger, R. Saint-Loup, Sinclair Pm
Rok vydání:	1996
Předmět:	Physics Raman frequencies Hydrogen chemistry.chemical_element Order (ring theory) Spectral shift Atomic and Molecular Physics and Optics symbols.namesake Laser linewidth chemistry symbols Atomic physics Raman spectroscopy Line (formation)
Zdroj:	Physical Review A. 54:402-409
ISSN:	1094-1622 1050-2947
DOI:	10.1103/physreva.54.402
Popis:	The broadening and shifting of the {ital Q} branch of H{sub 2} diluted in N{sub 2} are studied at temperatures between 300 and 1200 K. (i) In order to account for the observed anomalies (asymmetric profiles and nonlinearity of the linewidth versus perturber concentration), the results are interpreted using a speed-dependent model in its general form. This model introduces the speed dependence of the shift and the broadening. In contrast with the previous H{sub 2}{endash}rare-gas studies, the high-temperature measurements prove the necessity to include speed-dependent broadening that was ignored in the previous studies. (ii) Concomitantly, we report as well pure H{sub 2} results including Raman frequencies for the {ital Q}(7{endash}9) lines and broadening and shifting results at 800 and 1200 K. A consistent set of data is deduced for H{sub 2}-N{sub 2} up to 1200 K and the proposed model would be pertinent at higher temperatures for combustion applications. {copyright} {ital 1996 The American Physical Society.}
Databáze:	OpenAIRE
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