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Carbon Monoxide The carbon-monoxide chemical laser exhibits a variety of pumping reactions. Laser action was first reported by Pollack in CS2/Oz photolysis 195). O + S02 Initiation Propagation and laser pumping (2s) SO2 + S Termination 02 may be substituted by NOz with some minor changes 127). +v) + N(~D) (29) or A very interesting way of pumping a CO laser has been opened up recently in the discharge-initiated combustion of acetylene 130) or cyanogen 131). Table 7 lists the published work on CO chemical lasers, arranged according to the chemistry; it also reflects the history of the field.

These considerations lead to a general discussion of exciplex lasers. This is a well-established laser scheme for dye lasers where charge-taransfer complexes of excited molecules form the upper lasing state. Examples are the dyes 4-methyl-umbelliferone or N-methylacridin 92). Such exciplex laser systems could perhaps also be pumped by chemical reactions in systems of the type investigated by Weller et al. 9~). tEnef--V ,o 1 ,~ Exc]tecl Donor accepter t t cl (4s) Excited charge transfer comptex Our last example of this class of lasers is the xenon laser recently reported by Basov et al.

For an absorbed energy of 5 m J, the stimulated emission energy was found to be 100 mJ. Therefore Eemlsston]Eabsorptlou = 2 0 and the quantum yield of generation was Eemtssion~emtssion/Eabsorption)~absorption ~ 180 . 57 Future Chemical Lasers The quantum yield obtained in this manner depends on the experimental conditions. It is still not clear how much chain-branching contributes to the observed chain length of > 180 steps. Since chain-branching in the H2/Fg. system reties on either energy transfer or thermal branching, attempts have also been made to explore the possibility of material chains by substituting for H2 hydrocarbon components in which the generation of more than one radical per reaction step can produce branching.

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