Abstract
This paper is a contribution to the current discussion on radiative lifetime, or the Einstein coefficient for spontaneous emission of singlet delta oxygen [O<SUB>2</SUB>(<SUP>1</SUP>(Delta) <SUB>g</SUB>)]. A verification of widely-used the A-coefficient by Badger et al. (2.58 X 10<SUP>-4</SUP> s<SUP>-1</SUP>) in emission spectroscopy for determination of O<SUB>2</SUB>(<SUP>1</SUP>(Delta) <SUB>g</SUB>) 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 O<SUB>2</SUB>(<SUP>1</SUP>(Delta) <SUB>g</SUB>) 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<SUP>-4</SUP> s<SUP>-1</SUP>, that is slightly less than the Badger et al. value.
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