Decay constant for singlet oxygen in the solvent:

Acetophenone

Darmanyan, A.P.; Vidoczy, T.; Irinii, G.; Gal, D.
Bull. Acad. Sci. USSR, Div. Chem. Sci. 32(12): 2423-9 (1983)

Decay rate is 3.8 x 104 s–1

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

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