Role of O2(b) and I2 (A′, A) in chemical oxygen-iodine laser dissociation process

被引：0
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作者：
Azyazov, Valeriy N. [1 ,2 ]
Heaven, Michael C. [1 ,2 ,3 ]
机构：
[1] Emory University, Atlanta, GA 30322
[2] Department of Chemistry
[3] AIAA
来源：
AIAA Journal | 2006年 / 44卷 / 07期
关键词：
Kinetic studies were carried out to explore the role of electronically excited iodine [I2(A′; A)] in the dissociation of I2 by singlet oxygen; and the possible role of I22 + O2(b) energy transfer as the initiation step of the dissociation sequence. Flow-tube measurements that utilized a chemical singlet oxygen generator were used evaluate the contribution of the O2(b) + I2 reaction. The rate of I2 dissociation was examined under conditions where varying concentrations of CO2 were used to quench O2(b). Pulsed laser pump-probe experiments were used to study the relaxation kinetics of I2(A′). Rate constant for quenching of I2(A′) by Ar(2.7 × 10-14 cm3/s); I2; (4.8; ×; 10-11; cm3/s); and CO2 (8.5 × 10 -13 cm3/s) were measured. An I2 dissociation model in which the electronically excited intermediate I2(A′ or A) is populated by collisions with vibrationally excited O2(a) was found to be in good agreement with experiment. Copyright © 2006 by the American Institute of Aeronautics and Astronautics; Inc. All rights reserved;
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页码：1593 / 1600
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