LINESHAPE STUDIES OF ROTATIONAL TRANSITIONS OF OZONE AND NITRIC ACID
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Date
2004
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Publisher
Ohio State University
Abstract
In the framework of a contract provided by the European Space Agency, linewidth measurements have been performed on selected rotational lines of ozone and nitric acid, mostly located between 300 and 350 GHz, in the B and C bands of the MASTER platform. Broadening parameters have been determined for $O_{3}$ in collision with $N_{2}$ and $O_{2}$ at five different temperatures in the 190-300K range. For nitric acid, only air broadening coefficients were measured at 296K. The experiments have been performed at LMSB and PhLAM by using both different experimental set-ups and different analysis procedures. At PhLAM, the true lineshapes were observed with a video-type spectrometer and compared to Voigt and Galatry theoretical models. At LMSB, a Galatry model has been used to analyse the second derivative of the natural line profiles recorded with a frequency modulation spectrometer. Several lines of ozone and nitric acid were measured in both laboratories. The results of the intercomparison will be discussed.
Description
Author Institution: Laboratoire de Physique des Lasers, Atomes et Mol\'{e}cules, UMR CNRS 8523, Universit\'{e} de Lille 1; Laboratory of Millimetre-Wave Spectroscopy of Bologna, Dipartimento di Chimica ``G. Ciamician'', Universit\`{a} di Bologna