O2(1deltag) radiative lifetime: contribution to discussion on the Einstein A-coefficient used in COIL for O2(1deltag) determination from fundamental emission

Jarmila Kodymova; Otomar Spalek

doi:10.1117/12.350643

7 June 1999 O₂(¹Δ_g) radiative lifetime: contribution to discussion on the Einstein A-coefficient used in COIL for O₂(¹Δ_g) determination from fundamental emission

Jarmila Kodymova, Otomar Spalek

Author Affiliations +

Proceedings Volume 3612, Gas and Chemical Lasers and Intense Beam Applications II; (1999) https://doi.org/10.1117/12.350643
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

This paper deals with an estimation of the Einstein A-coefficient for spontaneous emission of singlet delta oxygen, 02(1?g), fld contributes to a current discussion that was launched recently about the conventionally used value of 2.58 x 10-4 s-1 by Badger et al.1 (a half-lifetime of O2(1?g) corresponding to 45 min).The A-value is used in a Chemical Oxygen- Iodine Laser (COIL) for an evaluation of O2(1?g) concentration determined from its fundamental emission. The published values of the A-coefficient substantially differ, corresponding to a radiative lifetime of O2(1?g), ??rad from ~53 min to ~151 min. This fact can make questionable an evaluation of COIL performance. In this paper, the Einstein A-coefficient was computed from the comparison of O2(1?g) concentrations obtained by two independent experimental methods - the electron paramagnetic resonance (EPR), and the emission spectroscopy at which a proposed mathematical model for calculation of O2(1?g) concentration was used. Singlet oxygen was generated chemically by the reaction used in a COIL, in contrast to other papers concerned in this fundamental phenomena. A great effort in our work was devoted to the EPR spectra evaluation as it was shown that it affects crucially the resulting value of the A-coefficient. The average value of the Einstein A-coefficient following from our investigation is equal to (2.24 ± 0.40) x 10-4 s-1 that corresponds to ??rad of~ 74 min (a half-lifetime of 51 min)

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Jarmila Kodymova and Otomar Spalek "O₂(¹Δ_g) radiative lifetime: contribution to discussion on the Einstein A-coefficient used in COIL for O₂(¹Δ_g) determination from fundamental emission", Proc. SPIE 3612, Gas and Chemical Lasers and Intense Beam Applications II, (7 June 1999); https://doi.org/10.1117/12.350643

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KEYWORDS

Oxygen

Absorption

Chemical lasers

Calibration

Mathematical modeling

Chemical oxygen iodine lasers

Chlorine

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