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Proceedings Paper

Line-broadening and line-mixing effect in ν3 band of CH4 perturbed by He gas
Author(s): I. M. Grigor'ev; N. N. Filippov; M. V. Tonkov; T. Gabard; R. Le Doucen
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Paper Abstract

The spectra of CH4-He mixtures were measured in the P- and R-region of v3 vibration-rotation band at lower pressures of 0.26 - 1.0 bar and for the whole band at higher pressures up to 90 bar. The broadening line coefficients were found from lower pressure data for the lines of P branch. These coefficients were calculated in the frame of the semi-classical approach. They agree with the experimental values, but a small J-dependent deviation was observed. The line mixing effect was observed. At higher pressure it was interpreted in the terms of the adjusted branch-coupling model. At lower pressure the line mixing effect was found to be especially pronounced in the region of relatively weak lines forming the clusters R(16) - R(19).

Paper Details

Date Published: 25 January 2000
PDF: 5 pages
Proc. SPIE 4063, 13th Symposium and School on High-Resolution Molecular Spectroscopy, (25 January 2000); doi: 10.1117/12.375383
Show Author Affiliations
I. M. Grigor'ev, St. Petersburg State Univ. (Russia)
N. N. Filippov, St. Petersburg State Univ. (Russia)
M. V. Tonkov, St. Petersburg State Univ. (Russia)
T. Gabard, Univ. de Bourgogne (France)
R. Le Doucen, Univ. de Rennes I (France)


Published in SPIE Proceedings Vol. 4063:
13th Symposium and School on High-Resolution Molecular Spectroscopy
Leonid N. Sinitsa, Editor(s)

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