Exciton Acceptor-like

For dilute solutions of essentially independent donor and acceptor molecules the Forster or resonance interaction is quite important in molecular aggregrates and in molecular crystals exciton interactions are likely to be important. When the interaction is strong the excitation is not localized on the donor or acceptor but is spread over both. If larger aggregrates are involved, the excitation can be spread over many molecules/33-3 This can easily be seen for the case of a dimer where the donor and acceptor are... 

The soliton concept is likely to prove fruitful in many aspects of photochemistry especially where organized systems are involved, It has been proposed that charge transfer excitons in mixed-stack donor-acceptor compounds exist in a variety of solitonic states . In this effect charge transfer states couple to lattice phonons in the crystal lattice to form the comparatively stable solitons. 

Should a system contain donor and acceptor moieties, an exciton like behavior can be observed when the charges recombine. Again, effective mass theory can present us with the energy of the observed transition, as shown in equation (5) ... 

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