INTENSITY AND POSITION MEASUREMENTS OF CARBON DIOXIDE LINES IN THE 4370 TO 4640 $cm^{-1}$ REGION

Author Institution: NASA AMES Research Center, , MS 245/4, Moffett Field, CA 94035-1000.$^{1}$B. Bezard, C. de Bergh, D. Crisp, and J.-P. Maillard, Nature 245, 508 (1990). $^{2}$C. R. Pollock, F.R. Petersen, D. A. Jennings, and J. S. Wells, J. Mol. Spectrosc. 99, 357 (1983).A set of 14 spectra of the carbon dioxide absorption bands in the 4300 to 4700 $cm^{-1}$ region were obtained with a BOMEM DA3.002 FTS and a White cell using absorption path lengths between 507 and 1307 meters. The principal purpose of this work was to make the first laboratory measurements of the transition moment and Herman-Wallis intensity parameters of the $^{12} C^{16} O_{2}$ $(31^{1}O)_{IV} -(00^{\circ}00)$ band at $4416.15 cm^{-1}$. This weak band was recently found to be prominent in the thermal emission spectrum of the dark side of $Venus^{1}$. Our measured rotationless transition moment of this band is $R^{2} = (1.41\pm0.14)$ $x10^{-11}$ $Debye^{2}$. Line positions for this band were calibrated using the 2-0 $band^{2}$ of CO. The spectra of CO and $CO_{2}$ were recorded simultaneously with a small amount of added CO to the $CO_{2}$. In this spectral region we have also recorded data which is suitable for intensity and positional work on the $(31^{1}0)_{III} - (00^{\circ}0)$, $(32^{2}0)_{III} - (01^{1}0)$ and $(40^{\circ}0)_{IV} - (01^{1}0)$ bands of $^{12}C^{16}O_{2}$ and the $(00^{\circ}2)_{I} - (00^{\circ}0)$ band of $^{13}C^{16}O^{18}O$