Attempt to verify experimental Einstein A-coefficient used for O2(1Deltag) determination in COIL

Otomar Spalek; Jarmila Kodymova; Vaclav Balek; Pavel Stopka; Ivo Micek

doi:10.1117/12.334488

22 December 1998 Attempt to verify experimental Einstein A-coefficient used for O₂(¹Δ_g) determination in COIL

Otomar Spalek, Jarmila Kodymova, Vaclav Balek, Pavel Stopka, Ivo Micek

Proceedings Volume 3574, XII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference; (1998) https://doi.org/10.1117/12.334488
Event: Twelfth International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, 1998, St. Petersburg, Russian Federation

Abstract

This paper is a contribution to the current discussion on radiative lifetime, or the Einstein coefficient for spontaneous emission of singlet delta oxygen [O₂(¹(Delta) _g)]. A verification of widely-used the A-coefficient by Badger et al. (2.58 X 10^-4 s^-1) in emission spectroscopy for determination of O₂(¹(Delta) _g) concentration in Chemical Oxygen-Iodine Laser (COIL) was examined. Two independent comparative techniques, the EPR and emission spectroscopy, completed by a proposed mathematical model for calculation of O₂(¹(Delta) _g) concentration from emission measurements, were employed. Singlet oxygen was generated chemically by a conventional way used in COIL. Within the accuracy of the both experimental techniques, the value of the Einstein A-coefficient estimated by this investigation is equal to (2.31 plus or minus 0.51) X 10^-4 s^-1, that is slightly less than the Badger et al. value.

Citation Download Citation

Otomar Spalek, Jarmila Kodymova, Vaclav Balek, Pavel Stopka, and Ivo Micek "Attempt to verify experimental Einstein A-coefficient used for O₂(¹Δ_g) determination in COIL", Proc. SPIE 3574, XII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (22 December 1998); https://doi.org/10.1117/12.334488

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