TEMPERATURE DEPENDENT MEASUREMENTS AND MODELING OF ABSORPTION BY $CO_{2}-N_{2}$ MIXTURES IN THE FAR WING OF THE $4.3 \mu m CO_{2}$ BAND
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Date
1989
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Ohio State University
Abstract
We present measurements of the absorption by $CO_{2}-N_{2}$ mixtures in the $4.3 \mu m$ region. Experiments have been made in the 300-800 K. and 0-60 bar ranges; they are in good agreement with previous determinations below 296 K. Frequency and temperature dependent factors $\chi$ are introduced in order to account for the sublorentzian behaviour of $CO_{2}$ far line-wings. Their dependences on temperature are deduced from experimental results beyond the $4.3 \mu m$ band-head in the 193-773 K range for both $CO_{2}-CO_{2}$ and $CO_{2}-N_{2}$ and fitted by simple analytical functions. Comparisons between experimental and theoretical spectra in both sides of the band ($2100-2600 cm^{-1}$ range) are presented. It is shown that calculations using $\chi$ factors are inaccurate near line-centers at elevated pressure.
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Author Institution: Laboratoire E.M.2.C du CNRS (UPR 73) et de l'Ecole Centrale des Arts et Manufactures, Ecole Centrale, Grande voie des Vignes