The laser-flash photolysis of propanone, butanone, and 2-pentanone were carried out in dichloromethane (265 nm, 15 ns flash duration). The emission spectra (fluorescence, phosphorescence, and P-type delayed fluorescence) and the transient absorption spectra (triplet state and acetyl radical) were recorded. From the decays of the emission and the absorption, the unimolecular (triplet decay) and bimolecular (T–T annihilation and self quenching) reaction-rate constants were determined. Oxygen quenched the triplet states with a diffusion-controlled rate constant (kO2=ca. 3×10 dm3mol−1 s−1).
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Naito et al. (1984) studied this question.
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