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Proceedings Paper

Iodine dissociation in the photochemistry of N[sub]2[/sub]O/I[sub]2[/sub] mixtures
Author(s): V. N. Azyazov; D. Postell; M. C. Heaven
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Paper Abstract

A new kinetic scheme for the dissociation of I2 by O2(a) has been proposed by Azyazov et al. (J. Chem. Phys. 130, 104306/9 (2009)). In principle, the reactions initiated by UV photolysis of N2O/I2 mixtures can be used to probe the chain propagation stage of this dissociation model, and provide additional validation. In the present study, 193 nm laser photolysis of N2O/I2 mixtures was used to initiate secondary chemical reactions and to produce iodine atoms. Singlet oxygen was generated in this system by the fast reaction O(1D)+N2O→ O2(a)+N2. Emission spectroscopy and laser induced fluorescence techniques were used to follow the time evolutions of I* and I2. The photolysis of N2O/I2 mixtures creates all of the species needed to sustain the chain propagation stage of I2 dissociation process. However, it was found that the high pressures of N2O needed to generate sufficient concentrations of O2(a) suppressed the I2 dissociation process. Computational modeling indicated that suppression of the chain propagation reactions under the conditions examined was consistent with the revised dissociation model.

Paper Details

Date Published: 17 February 2010
PDF: 6 pages
Proc. SPIE 7581, High Energy/Average Power Lasers and Intense Beam Applications IV, 758105 (17 February 2010); doi: 10.1117/12.843856
Show Author Affiliations
V. N. Azyazov, 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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