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H2-broadening coefficients in the ν3 band of CH3D at low temperatures

✍ Scribed by Christophe Lerot; Jacques Walrand; Ghislain Blanquet; Jean-Pierre Bouanich; Muriel Lepère

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
164 KB
Volume
219
Category
Article
ISSN
0022-2852

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✦ Synopsis

Using a diode-laser spectrometer, we have measured H 2 -broadening coefficients of CH 3 D at low temperatures (153.5, 183.5, and 223.5 K) for four lines in the m 3 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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