Self-broadening coefficients in the ν4 band of CH4 by diode-laser spectroscopy |
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Authors: | Muriel Lepère |
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Institution: | Laboratoire de Spectroscopie Moléculaire, Facultés Universitaires Notre-Dame de la Paix, 61, rue de Bruxelles, B-5000 Namur, Belgium |
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Abstract: | With a diode-laser spectrometer, we have measured self-broadening coefficients of 42 lines of the P-, Q- and R-branches in the ν4 fundamental band of CH4 at room temperature, with J values ranging between 1 and 12. For the determination of self-broadening parameters, we have fitted to the experimental lineshape two theoretical line profiles: the Voigt profile taking into account Doppler and collisional broadenings, and the hard collision model developed by Rautian and Sobel’man incorporating Dicke narrowing. |
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Keywords: | Tunable diode-laser spectrometer Methane Self-broadening coefficients |
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