Xe-broadening coefficients of 12CH3D: a test of theoretical line shapes |
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Authors: | Christophe Lerot Ghislain Blanquet Jean-Pierre Bouanich Jacques Walrand Muriel Lepère § |
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Institution: | 1. Laboratoire de Spectroscopie Moléculaire , Facultés Universitaires Notre-Dame de la Paix , 61, rue de Bruxelles, B-5000 Namur, Belgium;2. Laboratoire de Photophysique Moléculaire , CNRS, Université de Paris-Sud , Batiment 350, F-91405 Orsay cedex, France |
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Abstract: | We present the Xe-broadening coefficients for six lines belonging to the ν3 band of 12CH3D measured at room temperature with a diode-laser spectrometer. The collisional widths are obtained from least-squares fitting of each absorption line with theoretical line shapes. We used the well-known Voigt profile, the soft and hard collision models considering the collisional narrowing and also line shapes taking into account the speed dependence of the collisional cross-section. The results derived by these different models are compared with each other and with theoretical broadening coefficients. The calculations are based on a semiclassical impact formalism that includes the atom–atom Lennard–Jones potential for CH3D–Xe interactions in which CH3D is considered as a linear molecule. |
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