$O2(a1Δ)$ Quenching In The O/O2/O3 System Available to Purchase

The development of discharge singlet oxygen generators (DSOG’s) that can operate at high pressures is required for the power scaling of the discharge oxygen iodine laser. In order to achieve efficient high‐pressure DSOG operation it is important to understand the mechanisms by which singlet oxygen $(O2(a1Δ))$ is quenched in these devices. It has been proposed that three‐body deactivation processes of the type $O2(a1Δ)+O+M→2O2+M$ provide significant energy loss channels. To further explore these reactions the physical and reactive quenching of $O2(a1Δ)$ in $O(3P)/O2/O3/CO2/He/Ar$ mixtures has been investigated. Oxygen atoms and singlet oxygen molecules were produced by the 248 nm laser photolysis of ozone. The kinetics of $O2(a1Δ)$ quenching were followed by observing the 1268 nm fluorescence of the $O2a1Δ‐X3∑$ transition. Fast quenching of $O2(a1Δ)$ 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.