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It has been stated frequently that laser action in this system is ultimately limited by the formation of molecular iodine which is a very efficient quencher for I* (Reaction 6). The I9. formation with CFsI, however, is relatively slow and inefficient and for the experimental 31 Specific Chemical Laser Systems conditions stated above has to be taken into account only at longer times. Once I2 has been formed, processes 5 and 6 proceed with high efficiency. After completion of the fast Reactions 8 and 9, the gas mixture contains mainly CF3I, C~F6, I* and I together with some impurities like 02.

Table 8 contains a summary of published transfer rates which are very large (corresponding to 50--200 collisions). T a b l e 8. V i b r a t i o n a l e n e r g y t r a n s f e r in H F - - C O ~ a n d D F - - C O z m i x t u r e s Process k sec-ltorrl Ref. 7• 9 104 3 . 4 9 104 1 . 8 6 . 6 4. 2 9 104 140) 143) 143) CO3(001) --}- H F ( v = 0) 9 COs(nm0) + HF(v =0) a) O t h e r v a l u e s o b t a i n e d w i t h different a s s u m p t i o n s . Conventional CO~ lasers are pumped in electric discharges.

Pumping the P-branch transitions of v = 0 -*- 1 produces gain at the coupled rotational transitions in the v-----1 state. The principle is shown in Fig. 18. As stated in the above paper, the gain is very high and anisotropic and thus exhibits directional properties. V=IEXCITED . % . . FAR IR VIBRATIONAL t v = . J ' = J " 2 T ' ~ ROTATIONAL STATE C A {- OSCILLATION If Ps(J|PUMPI I IV= t. JI iv v,a# "_2F Fig. 3 Mach no. 80 Area ratio {A/A*} Temperature ratio Velocity ratio (T~ITo) uj[o~o(N~} Some effort has also been expended in analyzing the emission spectra of HC1, HBr (Table 6) and CO lasers.

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