Abstract
Using the TRMC technique, small transient changes in the microwave conductivity (dielectric loss) of a medium that occur on laser flash-photolysis can be monitored with nanosecond time- resolution. The method is described. Its application is illustrated with results on photo-induced charge separation in the singlet and triplet excited states of dilute solutions of donor-spacer- acceptor molecules. Both conjugated $PI-bond and nonconjugated (sigma) -bond spacers have been investigated. Particular attention is paid to the extension of the lifetime of the highly dipolar excited states formed on photolysis either by the formation of metastable triplet states or by intramolecular `through-bond' electron tunneling. The results could be relevant to the design of molecular optoelectric devices.© (1991) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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