The methods of singlet oxygen detection for DOIL program

Nikolay N. Yuryshev; Andrei A. Ionin; Mikhail P. Frolov; Yurii M. Klimachev; Igor V. Kochetov; Andrei A. Kotkov; Anatolii P. Napartovich; Yurii P. Podmar’kov; Leonid V. Seleznev; Dmitrii V. Sinitsyn; Nikolai P. Vagin

doi:10.1117/12.547068

20 September 2004 The methods of singlet oxygen detection for DOIL program

Nikolay N. Yuryshev, Andrei A. Ionin, Mikhail P. Frolov, Yurii M. Klimachev, Igor V. Kochetov, Andrei A. Kotkov, Anatolii P. Napartovich, Yurii P. Podmar’kov, Leonid V. Seleznev, Dmitrii V. Sinitsyn, Nikolai P. Vagin

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Proceedings Volume 5448, High-Power Laser Ablation V; (2004) https://doi.org/10.1117/12.547068
Event: High-Power Laser Ablation, 2004, Taos, New Mexico, United States

Abstract

The problem of development of a singlet delta oxygen O₂(¹Δ_g) (SDO) generators alternative to chemical one needs application of the accurate methods of measuring the SDO concentration. A chemical SDO generator providing efficient operation of a chemical oxygen-iodine laser (COIL) is proposed to be used as a reference source for absolute calibration of the system measuring the SDO concentration. The principle of the COIL operation results in the threshold and output COIL parameters make it possible to evaluate the SDO yield with a satisfactory accuracy. A convenient sparger chemical SDO generator was applied as a reference source for absolute calibration of detectors of dimole (λ=634nm) and b→X (λ=762 nm) radiations. The values of b-state concentration formed in a longitudinal electric discharge were evaluated. The intracavity laser spectroscopy (ICLS) was absolutely calibrated for measuring the SDO concentration. ICLS method has a very high sensitivity and makes it possible to monitor the absorption corresponding to the O₂(¹Δ_g)→O₂(¹Σ_g⁺) (λ = 1.91 μm) transition. The cross-sections of lines of the Q - branch of the vibrational 0-0 band of the a¹Δ_g → b¹Σ_g⁺ transition of molecular oxygen were measured. The method developed was applied to measure the concentration of singlet oxygen produced in the microwave discharge. He - Ne laser (λ = 633 nm) was used for absolute calibration of a system monitoring the dimole radiation. The rate constant of the process responsible for dimole emission was measured. The value obtained k_d=7.34•10^-23 cm³/s is in agreement with literature.

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Nikolay N. Yuryshev, Andrei A. Ionin, Mikhail P. Frolov, Yurii M. Klimachev, Igor V. Kochetov, Andrei A. Kotkov, Anatolii P. Napartovich, Yurii P. Podmar’kov, Leonid V. Seleznev, Dmitrii V. Sinitsyn, and Nikolai P. Vagin "The methods of singlet oxygen detection for DOIL program", Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); https://doi.org/10.1117/12.547068

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