Molecular singlet delta oxygen quenching kinetics in the EOIL system

A. P. Torbin; P. A. Mikheyev; A. A. Pershin; A. V. Mezhenin; V. N. Azyazov; M. C. Heaven

doi:10.1117/12.2064825

3 February 2015 Molecular singlet delta oxygen quenching kinetics in the EOIL system

A. P. Torbin, P. A. Mikheyev, A. A. Pershin, A. V. Mezhenin, V. N. Azyazov, M. C. Heaven

Proceedings Volume 9255, XX International Symposium on High-Power Laser Systems and Applications 2014; 92551T (2015) https://doi.org/10.1117/12.2064825
Event: XX International Symposium on High Power Laser Systems and Applications, 2014, Chengdu, China

Abstract

The development of a discharge oxygen iodine laser (DOIL) requires efficient production of singlet delta oxygen O₂(α¹ Δ) in electric discharge. It is important to understand the mechanisms of of O₂α¹ Δ) quenching in these devices. To gain understanding of this mechanisms quenching of O₂(α^]1 Δ)in O/O₂/O₃/CO₂/He mixtures has been investigated. Oxygen atoms and singlet oxygen molecules were produced by the 248 nm laser photolysis of ozone. The kinetics of O₂(α¹Δ) quenching were followed by observing the 1268 nm fluorescence of O₂α¹ Δ → X³Σ transition. It is shown that vibrationally excited ozone O₃(υ;) formed in the three-body recombination O + O₂+ M →O₃(υ) + M is an important O/O₂/O₃ quenching agent in O/O₂/O₃ systems. The process O₃(υ ≥2) + O₂(a¹ Δ)→ 2O₂ + O is the main O₂(α¹ Δ) deactivation channel in the post-discharge zone. If no measures are taken to decrease oxygen atom concentration, the contribution of this process into overall O₂(α¹Δ) removal is significant even in the discharge zone. It was found in experiment that addition of species that are good quenchers of O₃(υ;) decrease O₂(a¹ Δ) deactivation rate in the O/O₂/O₃ mixtures.

Citation Download Citation

A. P. Torbin, P. A. Mikheyev, A. A. Pershin, A. V. Mezhenin, V. N. Azyazov, and M. C. Heaven "Molecular singlet delta oxygen quenching kinetics in the EOIL system", Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92551T (3 February 2015); https://doi.org/10.1117/12.2064825

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