ON THEORETICAL TREATMENTS OF ELECTRONIC EXCITATION-ENERGY TRANSFER

In this paper, we review the generalized Forster-Dexter theory to trea t photoinduced electronic energy transfer for a system in dense media and for an isolated system (i.e., a system in the collision-free condi tion). Instead of expressing the rate of energy transfer in terms of s pectral overlap, the expression of the energy-transfer rate constant i s obtained by evaluating a Fourier integral involved in the energy tra nsfer rate constant using the saddle-point method. In this way, the en ergy-yap dependence, and the effect of temperature and the isotope eff ect on the energy transfer can be easily studied. The effect of bridge groups connecting between donor and acceptor chromophores on the intr amolecular energy transfer is also studied.