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Proceedings Paper

Chemical kinetics of discharge-driven oxygen-iodine lasers
Author(s): Valeriy N. Azyazov; Md. Humayun Kabir; Ivan O. Antonov; Michael C. Heaven
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Paper Abstract

Oxygen-iodine lasers that utilize electrical discharges to produce O2(a1Δ) are currently being developed. The discharge generators differ from those used in chemical oxygen-iodine lasers in that they produce significant amounts of atomic oxygen and traces of ozone. As a consequence of these differences, the chemical kinetics of the discharge laser are markedly different from those of a conventional chemical oxygen-iodine laser (COIL). The reactions of O with iodine include channels that are both beneficial and detrimental to the laser. The beneficial reactions result in the dissociation of I2 while the detrimental processes cause direct and indirect removal of I(2P1/2) (denoted I*, the upper level of the laser). We have examined kinetic processes relevant to the laser through studies of photo-initiated reactions in N2O/CO2/I2 mixtures. The reactions have been monitored using absorption spectroscopy, laser induced fluorescence and time-resolved emission spectroscopy. It has been established that deactivation of I* by O atoms is a critical energy loss process. We have determined a rate constant of (1.2±0.1)×10-11 cm3 s-1 for this reaction. As part of this effort the branching fraction for the formation of O2(a) from the reaction of O(1D) with N2O was determined to be 0.38. This result has implications for lasers based on photolysis of O3/N2O/I2 mixtures and the formation of O2(a) in the upper atmosphere.

Paper Details

Date Published: 26 April 2007
PDF: 8 pages
Proc. SPIE 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 63460I (26 April 2007); doi: 10.1117/12.737190
Show Author Affiliations
Valeriy N. Azyazov, Emory Univ. (United States)
Md. Humayun Kabir, Emory Univ. (United States)
Ivan O. Antonov, Emory Univ. (United States)
Michael C. Heaven, Emory Univ. (United States)

Published in SPIE Proceedings Vol. 6346:
XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Dieter Schuöcker, Editor(s)

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