Iodine dissociation in the photochemistry of N[sub]2[/sub]O/I[sub]2[/sub] mixtures

V. N. Azyazov; D. Postell; M. C. Heaven

doi:10.1117/12.843856

17 February 2010 Iodine dissociation in the photochemistry of N₂O/I₂ mixtures

V. N. Azyazov, D. Postell, M. C. Heaven

Proceedings Volume 7581, High Energy/Average Power Lasers and Intense Beam Applications IV; 758105 (2010) https://doi.org/10.1117/12.843856
Event: SPIE LASE, 2010, San Francisco, California, United States

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.

Citation Download Citation

V. N. Azyazov, D. Postell, and M. C. Heaven "Iodine dissociation in the photochemistry of N₂O/I₂ mixtures", Proc. SPIE 7581, High Energy/Average Power Lasers and Intense Beam Applications IV, 758105 (17 February 2010); https://doi.org/10.1117/12.843856

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