Abstract
1. In the case of pulsed illumination of symmetrical cyanine dyes, there are transitory reversible changes in the absorption spectrum, due to the formation of photoisomers. For carbocyanine molecules with a substituent in the meso-position, as well as for thiamonomethinecyanine, an extremely low value of the quantum yield of photoisomerization was detected. 2. Cis-trans-photoisomerization occurs at the singlet excited level. 3. Measurements of the kinetics of relaxation revealed a first order of the reaction, in accord with the monomolecular process: trans(cis) ⇝ cis(trans).
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