Heterodyne frequency measurements. accurate to (20 \mathrm{kHz}). of 35 lines of the (00^{\circ} 2-\left[10^{\circ} 1,02^{0} 1\right]) band ((10.4 \mu \mathrm{m})) and 33 lines of the (00^{\circ} 2-\left[10^{\circ} 1,02^{\circ} 1\right]{\mu}) band ((9.4 \mu \mathrm{m})) of (\mathrm{CO}{2}) have been made with a sequence band (\mathrm{CO}{2}) laser stabilized to line center using the sub-Doppler (4.3-\mu \mathrm{m}) fluorescence. A saturated (4.3-\mu \mathrm{m}) fluorescence-stabilized regular band (\mathrm{CO}{2}) laser was used as the frequency reference for the heterodyne measurements. New molecular constants were obtained from a leastsquares fitting of these new measurements and the previous measurements. Calculated frequency and wavenumber tables for (\mathrm{CO}{2}) sequence band transitions using the new constants are presented Frequencies of the transitions from the ground state to the (00^{\circ} 2,\left[10^{\circ} 1,02^{0} 1\right]{1}), and (\left[10^{\circ} 1,02^{6} 1\right]{ฤฑ}) levels have been accurately determined to an accuracy of (0.2 \mathrm{MHz}) by adding the sub-Dopples heterodyne frequency measurements of the (\left[10^{\circ} 1,02^{0} 1\right]{1}-00^{\circ} 0) transitions made by A. Groh, D. Goddon, M. Schneider, W. Zimmerman, and W. Ubran (J. Mol. Spectrosc. 146, 161-168, 199I ).
(c) 1995 Academic Press. Inc.