Abstract
The photoexcited transient states of octadecylrhodamine B (R) and 2-(9-anthroyloxy) stearic acid (A) mixed in a stearic acid matrix have been studied by flash photolysis and picosecond fluorescence methods in Langmuir-Blodgett films. The two dominant excitation energy relaxation processes for the R monomer are an electron transfer from A to the excited singlet state of R and an energy transfer to the non-fluorescent R dimer. The excited R dimer relaxes via its triplet state. A charge separation process takes place in the triplet state leading to a radical pair.
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