Abstract
A plasma chemistry model is presented that explains the observed CO2 dissociation levels in a closed-cycle fast-axial-flow CO2 laser. The model includes reactions between the neutral species CO2, CO, O, O2, O3, H2O, and OH, and the negative ions O−, O−2, CO−3, and CO−4. Dissociation rates are computed by solving the electron Boltzmann equation for experimental values of the reduced field E/N. It is found that gas replenishment and the neutral recombination reaction between CO and the OH radical are the most effective mechanisms to suppress the CO concentration in the gas circuit. The influence of CO2 dissociation on the laser output power level is discussed.
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