H2-broadening coefficients in the ν3 band of CH3D at low temperatures |
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Authors: | Christophe Lerot Ghislain Blanquet Jean-Pierre Bouanich |
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Affiliation: | a Laboratoire de Spectroscopie Moléculaire, Facultés Universitaires Notre-Dame de la Paix, 61, rue de Bruxelles, B-5000 Namur, Belgium b Laboratoire de Photophysique Moléculaire et Applications, CNRS, Université de Paris-Sud, Bâtiment 350, F-91405 Orsay cedex, France |
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Abstract: | Using a diode-laser spectrometer, we have measured H2-broadening coefficients of CH3D at low temperatures (153.5, 183.5, and 223.5 K) for four lines in the ν3 band. The collisional widths are obtained by fitting each absorption line with three lineshape models: the Voigt, Rautian, and Galatry profiles. The broadening coefficients are also calculated on the basis of a semiclassical model of interacting linear molecules by considering an atom-atom Lennard-Jones potential in addition to electrostatic contributions. By comparing the broadening coefficients at room and low temperatures the temperature dependence of these broadenings has been determined both experimentally and theoretically. |
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Keywords: | Tunable diode-laser Monodeuterated methane Hydrogen Broadening coefficients Temperature dependence |
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