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Relaxation and Lineshape of the 500.4-GHz Line of Ozone Perturbed by N2 and O2

✍ Scribed by Dominique Priem; Jean-Marcel Colmont; François Rohart; Georges Wlodarczak; Robert R. Gamache

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
184 KB
Volume
204
Category
Article
ISSN
0022-2852

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✦ Synopsis

N 2 -and O 2 -broadened linewidths of the J ϭ 34 2,32 4 34 1,33 transition of ozone located at 500.4 GHz have been measured at three temperatures in the 247-295 K range by using a video-type spectrometer. Besides the Voigt profile commonly used as theoretical model for millimeter-wave investigations, different other theoretical lineshapes, the speed-dependent Voigt profile, the Galatry profile, and the speed-dependent Galatry profile, have been considered to analyze the experimental spectra, to retrieve the pressure-broadening parameters, and to give an account of the pointed out line-narrowing effect. The results for O 3 perturbed by N 2 and O 2 are finally compared to calculations based on the complex semiclassical theory of Robert and Bonamy, and with previous reported values involving the same kind of transitions. Finally, it is shown that observed line narrowings result nearly exclusively from the dependence of relaxation on molecular speeds.

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