FREQUENCY MEASUREMENTS AND MOLECULAR-CONSTANTS OF CO2 00(0)2-[10(0)1,02(0)1](I,II) SEQUENCE BAND TRANSITIONS

Heterodyne frequency measurements, accurate to 20 kHz, of 35 lines of the 00(0)2-[10(0)1,02(0)1](I) band (10.4 mu m) and 33 lines of the 00(0)2-[10(0)1,02(0)1](II) band (9.4 mu m) of CO2 have been made with a sequence band CO2 laser stabilized to line center using the sub-Doppler 4.3-mu m fluorescence. A saturated 4.3-mu m fluorescence-stabilized regular band CO2 laser was used as the frequency reference for the heterodyne measurements. New molecular constants were obtained from a least-squares fitting of these new measurements and the previous measurements. Calculated frequency and wavenumber tables for CO2 sequence band transitions using the new constants are presented. Frequencies of the transitions from the ground state to the 00(0)2, [10(0)1,02(0)1](I), and [10(0)1,02(0)1](II) levels have been accurately determined to an accuracy of 0.2 MHz by adding the sub-Doppler heterodyne frequency measurements of the [10(0)1,02(0)1](I)-00(0)0 transitions made by A. Groh, D. Goddon, M. Schneider, W. Zimmerman, and W. Ubran (J. Mel. Spectrosc. 146, 161-168, 1991). (C) 1995 Academic Press, Inc.