Chemical kinetics of discharge-driven oxygen-iodine lasers

Valeriy N. Azyazov; Md. Humayun Kabir; Ivan O. Antonov; Michael C. Heaven

doi:10.1117/12.737190

26 April 2007 Chemical kinetics of discharge-driven oxygen-iodine lasers

Valeriy N. Azyazov, Md. Humayun Kabir, Ivan O. Antonov, Michael C. Heaven

Proceedings Volume 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 63460I (2007) https://doi.org/10.1117/12.737190
Event: XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 2006, Gmunden, Austria

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(²P_1/2) (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.

Citation Download Citation

Valeriy N. Azyazov, Md. Humayun Kabir, Ivan O. Antonov, and Michael C. Heaven "Chemical kinetics of discharge-driven oxygen-iodine lasers", Proc. SPIE 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 63460I (26 April 2007); https://doi.org/10.1117/12.737190

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