Abstract
Rotational transitions in CH335Cl mixed with CO2 are recorded at 296K and total pressures up to 0.6Torr in the frequency interval 186–901GHz (1.6–0.3mm) for J=6→7, 10→11, 17→18, 22→23, 31→32, 33→34 and K=0–6, using the frequency-modulation spectrometer of the Laboratory PhLAM (Lille, France). These line-shapes are analyzed with the commonly used Voigt profile as well as with more refined Speed-Dependent Voigt and Galatry models accounting for the line narrowing induced, respectively, by the speed-dependence of the relaxation parameters and by velocity-changing collisions. Due to the high line intensities, the fitting procedure involves the full implementation of the Beer–Lambert law instead of its traditional linear approximation. The experimentally deduced J- and K-dependences of the pressure-broadening coefficients are further used to obtain the model parameters of a semi-empirical approach allowing massive calculations of line-shape parameters for enlarged ranges of rotational quantum numbers requested by spectroscopic databases.
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More From: Journal of Quantitative Spectroscopy and Radiative Transfer
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