Analysis of experimental bandshapes of the nu(3) band of CH3F in helium: the role of interbranch and intrabranch line mixing

F Thibault, J Boissoles, IM Grigoriev, NN Filippov, MV Tonkov

Research output

Abstract

We measured a series of absorption profiles of the nu(3) 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.

Original languageEnglish
Title of host publication13TH SYMPOSIUM AND SCHOOL ON HIGH-RESOLUTION MOLECULAR SPECTROSCOPY
EditorsLN Sinitsa
PublisherSPIE
Pages239-243
Number of pages5
ISBN (Print)0-8194-3697-6
DOIs
Publication statusPublished - 2000
Event13th Symposium and School on High-Resolution Molecular Spectroscopy - Tomsk, Russia
Duration: 4 Jul 19996 Jul 1999

Publication series

NamePROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)
PublisherSPIE-INT SOC OPTICAL ENGINEERING
Volume4063
ISSN (Print)0277-786X

Conference

Conference13th Symposium and School on High-Resolution Molecular Spectroscopy
CityTomsk, Russia
Period4/07/996/07/99

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