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Proceedings Paper

O2(a1Δ) quenching in O/O2/O3/CO2/He/Ar mixtures
Author(s): V. N. Azyazov; P. A. Mikheyev; D. Postell; M. C. Heaven
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Paper 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.

Paper Details

Date Published: 17 February 2010
PDF: 9 pages
Proc. SPIE 7581, High Energy/Average Power Lasers and Intense Beam Applications IV, 758108 (17 February 2010); doi: 10.1117/12.843857
Show Author Affiliations
V. N. Azyazov, P.N. Lebedev Physical Institute (Russian Federation)
P. A. Mikheyev, P.N. Lebedev Physical Institute (Russian Federation)
D. Postell, Emory Univ. (United States)
M. C. Heaven, Emory Univ. (United States)


Published in SPIE Proceedings Vol. 7581:
High Energy/Average Power Lasers and Intense Beam Applications IV
Steven J. Davis; Michael C. Heaven; J. Thomas Schriempf, Editor(s)

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