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25 January 2000 Line-broadening and line-mixing effect in ν3 band of CH4 perturbed by He gas
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Proceedings Volume 4063, 13th Symposium and School on High-Resolution Molecular Spectroscopy; (2000) https://doi.org/10.1117/12.375383
Event: 13th Symposium and School on High-Resolution Molecular Spectroscopy, 1999, Tomsk, Russian Federation
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).
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I. M. Grigor'ev, N. N. Filippov, M. V. Tonkov, T. Gabard, and R. Le Doucen "Line-broadening and line-mixing effect in ν3 band of CH4 perturbed by He gas", Proc. SPIE 4063, 13th Symposium and School on High-Resolution Molecular Spectroscopy, (25 January 2000); https://doi.org/10.1117/12.375383
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