Abstract
The kinetics of sensitized fluorescence of O2 has been recorded for the first time in solutions at transition from the second singlet excited state b{su1}Σ{sk{su\s+}/{in{itg}} to the first excited state \ga{su1}\gD{in{itg}} (b→a. We measured the quantum yield of the b→a-fluorescence at γ≈1.93 μm and assessed its probability with respect to the a→ X-phosphorescence at 1.27 μm. We show that the lifetime of the b→a-fluorescence (105 nsec for CCl4 and 140 nsec for CS2) becomes much shorter on addition of solvents with large frequencies of intramolecular vibrations. The measured radiative velocity constant of the b→a-transition Kb→a is by three orders of magnitude larger than for the phosphorescence (≈1.27 μm) of the a→X-transition from the first singlet to the ground triplet state. The method of recording IR fluorescence is promising for determining O2 in solutions and biosystems.
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Institute of Molecular and Atomic Physics of the National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 1, pp 5–8, January–February, 1998.
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Losev, A.P., Bachilo, S.M. & Nichiporovich, I.N. Kinetics of the b{su1}Σ{sk{su\s+}/{in{itg}}→\ga{su1}\gD{in{itg}} fluorescence of molecular oxygen in solutionsfluorescence of molecular oxygen in solutions. J Appl Spectrosc 65, 1–4 (1998). https://doi.org/10.1007/BF02674780
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DOI: https://doi.org/10.1007/BF02674780