Decay constant for singlet oxygen in the solvent:

Deuterium oxide/Ethanol (67:33)

Krasnovsky, A.A.,Jr.; Egorov, S.Yu.; Nasarova, O.V.; Yartsev, E.I.; Ponomarev, G.V.
Stud. Biophys. 124(2-3): 123-42 (1988)

Lifetime is 2.6 x 10–5 s
Decay rate is 3.8 x 104 s–1

Experimental method: pulsed laser photolysis, luminescence decay
Sensitizer is H2TPPS4–.

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