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5 June 2003 Kinetic studies for advanced iodine laser concepts
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Proceedings Volume 4971, Gas and Chemical Lasers and Intense Beam Applications IV; (2003)
Event: High-Power Lasers and Applications, 2003, San Jose, CA, United States
Singlet oxygen generators for COIL devices that involve discharge or optical excitation are currently being investigated. These generators deliver relatively high yields of O2(b1Σ+) as the flows do not contain water vapor. In addition, discharge generators provide high concentrations of O atoms. Dissociation of I2 by the reagent streams from these generators will follow different kinetic pathways than those that are most important when the flow from a chemical generator is used. To provide a basis for understanding the dissociation kinetics that will be relevant for discharge and optically driven COIL devices we have examined the quenching of O2(b) and O2(a) by I2. Dissociation of I2 by atomic oxygen and I*+O quenching have also been investigated. The primary findings are: (1) Quenching of O2(b) by I2 is fast (5.8x10-11 cm3 s-1) with a branching fraction of 0.4 for the channel O2(b)+I2→O2(a)+I2. (2) Quenching of O2(a) by I2 is too slow (k<5x10-16 cm3 s-1) to be the initiation step in the I2 dissociation process. (3) O2(a) is generated when I2 is dissociated by O atoms. (4) The upper bound for the rate constant for quenching of I* by O atoms is k<5x10-12 cm3 s-1.
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Jiande Han, Anatoly V. Komissarov, Scott P. Tinney, and Michael C. Heaven "Kinetic studies for advanced iodine laser concepts", Proc. SPIE 4971, Gas and Chemical Lasers and Intense Beam Applications IV, (5 June 2003);


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