Photophysical processes in the vapour-phase measured by the optic-acoustic effect. Part 2.—Triplet state yield and lifetime in high pressure biacetyl vapour

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Abstract
The photophysical processes in biacetyl vapour are studied using the optic-acoustic effect following excitation with radiation of wavelength 436 nm. An analysis is developed to apply the technique to second-order reactions, and the rate of triplet–triplet annihilation measured as 2.3(±0.3)× 1011 dm3 mol–1 s–1 at 298 K. A triplet yield of 0.97 ± 0.015 is determined.