Abstract
A multi-photon fast analog technique has been used to study nonradiative energy transfer from coumarin 460 to rhodamine 6G molecules. At low acceptor concentrations (<10 -2 mol/1) the fluorescence decay from coumarin deviates markedly from monoexponential behavior. The complex decay of the donor fluorescence reflects the time-dependent population of donor-acceptor pairs. Various energy transfer kinetics were investigated. The donor decay was found to be consistent with Förster kinetics and the critical energy transfer radius was found to be (5.46±0.10) nm.
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