Decay constant for singlet oxygen in the solvent:

Methanol/Water (50:50)

Young, R.H.; Brewer, D.; Keller, R.A.
J. Am. Chem. Soc. 95(2): 375-9 (1973)

Decay rate is 3 x 105 s–1

Experimental method: pulsed laser photolysis, substrate disappearance
Sensitizer is MB or RB,
Substrate is DPBF, kD = 3.7 x 105 s–1 when [DPBF] = 1.7 x 10–5 mol L–1 and beta = 5.5 x 10–5 mol L–1.

Merkel, P.B.; Nilsson, R.; Kearns, D.R.
J. Am. Chem. Soc. 94(3): 1030-1 (1972)

Lifetime is 3.5 x 10–6 s
Decay rate is 2.9 x 105 s–1

Experimental method: pulsed laser photolysis, substrate disappearance
Sensitizer is MB,
Substrate is DPBF.

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