Line broadening and line mixing effect in nu(3) band of CH4 perturbed by He gas

IM Grigoriev, NN Filippov, MV Tonkov, T Gabard, R Le Doucen

Research output

Abstract

The spectra of CH4-He mixtures were measured in the P- and R-region of nu(3) vibration-rotation band at lower pressures of 0.2-1.0 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).

Original languageEnglish
Title of host publication13TH SYMPOSIUM AND SCHOOL ON HIGH-RESOLUTION MOLECULAR SPECTROSCOPY
EditorsLN Sinitsa
PublisherSPIE
Pages212-216
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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