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Proceedings Paper

Experimental bandshapes of the v3 band of CH3F in helium: the role of interbranch and intrabranch line mixing
Author(s): F. Thibault; J. Boissoles; I. M. Grigor'ev; N. N. Filippov; M. V. Tonkov
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Paper Abstract

We measured a series of absorption profiles of the v3 band of CH3F perturbed by helium. The measurements were performed at room temperature for helium pressures from 1 to 90 atm. We observe significant deviations of measured profiles with respect to those calculated as a sum of lines having Lorentzian shapes. To interpret the observed deviations, we consider various models of line mixing. The calculations performed in the ECS approximation provide the most reasonable agreement with the measured band shapes reproducing the existing data on line broadening coefficients within the limits of experimental uncertainty. Special attention is paid to the analysis of the differences of interbranch and intrabranch line mixing, that is to the structure of relaxation matrix.

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: 10.1117/12.375388
Show Author Affiliations
F. Thibault, Univ. de Rennes I (France)
J. Boissoles, Univ. de Rennes I (France)
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)


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

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