Helium and argon line broadening in the ν2 band of CH4 |
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Authors: | T Gabard NM Grigorovich |
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Institution: | a Laboratoire de Physique de, l’Université de Bourgogne, UMR CNRS 5027, B.P. 47870, 21078 Dijon Cedex, France b Institute of Physics, St. Petersburg State University, Peterhof, 198504 St. Petersburg, Russia |
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Abstract: | The spectra of the gaseous mixtures CH4-He and CH4-Ar were obtained in the spectral region 1400-1750 cm−1 with a resolution up to 0.003 cm−1. Helium and argon pressure broadenings for the vibration-rotation lines of the ν2 band of CH4 have been estimated at room temperature for some lines in the P, Q, and R branches. These values were also calculated using the theoretical approach developed by Robert and Bonamy, extended to the case of tetrahedral molecules. The helium data have been found to be in a satisfactory agreement whereas a divergence of calculated and measured broadening coefficients has been evidenced in the case of argon. Simulations of the ν2 band shapes of methane perturbed by helium have also been performed. |
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Keywords: | Methane Vibration-rotation lines Line broadening |
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