Kinetics of oxygen discharges and I(2P1/2) excitation for EOIL

The electric oxygen-iodine laser (EOIL) concept uses an electric discharge plasma to generate an effluent flow containing singlet oxygen, O2(a1&Dgr;), and atomic oxygen, O, which react with I2 to excite the atomic iodine laser transition at 1.315 &mgr;m. This chemically rich system has unique characteristics, whose understanding requires systematic chemical kinetics investigation under carefully selected conditions to isolate the key reaction mechanisms. We describe a series of reacting flow measurements on the reactions of discharge-excited active-O2 with I2, using a comprehensive suite of optical emission and absorption diagnostics to monitor the absolute concentrations of O2(a1&Dgr;), O2(b1summation), O(3P), O3, I2, I(2P3/2), I(2P1/2), small-signal gain, and temperature. These multispecies measurements help to constrain the kinetics model of the system, and quantify the chemical loss mechanisms for I(2P1/2).

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