Application of Flash Photolysis in the Study of the Triplet State of Organic Substances

Flash photolysis is a relaxation method for the investigation of the mechanism of rapid photochemical reactions. The fundamental design and constructional features of spectroscopic apparatus for flash photolysis have been examined. Considerable attention has been devoted to the description of the sources for flash photolysis. The application of flash photolysis in the study of triplet states of organic substances in solutions is considered. The results obtained for the quantum yields and the triplet–triplet absorption spectra of aromatic hydrocarbons, carbonyl compounds, dyes, and pigments have been presented. The mechanisms and the kinetics of the deactivation of triplet states, the quenching mechanisms, and the role of the triplet state in photochemical reactions have been discussed.
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