Decay constant for singlet oxygen in the solvent:

Dimethyl sulfoxide

Guiraud, H.J.; Foote, C.S.
J. Am. Chem. Soc. 98(7): 1984-6 (1976)

Decay rate is ~5.2 x 104 s–1

Experimental method: continuous photolysis, substrate consumption
Sensitizer is RB,
Substrate is DPBF, A' = 2M2P. Measured betaA' = 0.055 mol L–1, assumed kA' in MeOH and DMSO are the same, used betaA' = 0.15 and kd = 1.4 x 105 s–1 in MeOH.

Nilsson, R.; Kearns, D.R.
J. Phys. Chem. 78(17): 1681-3 (1974)

Lifetime is ~3.0 x 10–5 s
Decay rate is ~3.3 x 104 s–1

Method not reported, may be direct method given in ref. [719325].

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