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Keywords:

  • Photochemie;
  • Reaktionskinetik

Abstract

The mechanism of the cis→trans-photoisomerization was investigated. Quantum yields of nearly unity were observed at temperatures around 180 K indicating that a twisting of the molecule excited into its S1-state occurs. A detailed analysis has shown that both, an isomerization via the singlet as well as via the triplet state is possible. A kinetic model has been proposed which describes quantitatively the experimental results.