Abstract
The development of a discharge oxygen iodine laser (DOIL) requires efficient production of singlet delta oxygen (O<sub>2</sub>(<i>a</i>)) in electric discharge. It is important to understand the mechanisms by which O<sub>2</sub>(<i>a</i>) is quenched in these devices. To gain understanding of this mechanisms quenching of O<sub>2</sub>(<i>a</i>) in O(<sup>3</sup>P)/O<sub>2</sub>/O<sub>3</sub>/CO<sub>2</sub>/He/Ar mixtures has been investigated. Oxygen atoms and singlet oxygen molecules were produced by the 248 nm laser photolysis of ozone. The kinetics of O<sub>2</sub>(<i>a</i>) quenching were followed by observing the 1268 nm fluorescence of the O<sub>2</sub> <i>a</i> → <i>X</i> transition. Fast quenching of O<sub>2</sub>(<i>a</i>) in the presence of oxygen atoms and molecules was observed. The mechanism of the process has been examined using kinetic models, which indicate that quenching by vibrationally excited ozone is the dominant reaction.
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