O[sub]2[/sub](a[sup]1[/sup]Delta) quenching in O/O[sub]2[/sub]/O[sub]3[/sub]/CO[sub]2[/sub]/He/Ar mixtures

V. N. Azyazov; P. A. Mikheyev; D. Postell; M. C. Heaven

doi:10.1117/12.843857

17 February 2010 O₂(a¹Δ) quenching in O/O₂/O₃/CO₂/He/Ar mixtures

V. N. Azyazov, P. A. Mikheyev, D. Postell, M. C. Heaven

Proceedings Volume 7581, High Energy/Average Power Lasers and Intense Beam Applications IV; 758108 (2010) https://doi.org/10.1117/12.843857
Event: SPIE LASE, 2010, San Francisco, California, United States

Abstract

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 O₂ a1Δ-X³Ε 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.

Citation Download Citation

V. N. Azyazov, P. A. Mikheyev, D. Postell, and M. C. Heaven "O₂(a¹Δ) quenching in O/O₂/O₃/CO₂/He/Ar mixtures", Proc. SPIE 7581, High Energy/Average Power Lasers and Intense Beam Applications IV, 758108 (17 February 2010); https://doi.org/10.1117/12.843857

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