PRESSURE SHIFTS IN CARBON DIOXIDE AND ITS ISOTOPES

The theory of pressure broadening and pressure shifts of emission and absorption lines has been devel-oped over the years. Only. recently has it been possible to use Doppler-free techniques to measure the linewidths and lineshifts within the resolution of the homogeneous linewidths. Pressure shifts in the 9 and 10 pm lasing transition in CO2 is measured using a two channel 4.3p saturated fluorescence stabilized CO2 laser heterodyne system. These pressure shift measurements are unique because the J dependence and vibrational dependence (relating to the different Fermi resonances in the different CO2 isotopes) can studied using this saturated fluorescence technique. They are also important in providing an estimate of the reproducibility of the many CO2 lasing transition