F�rster's resonance energy transfer (FRET) theory made fundamental contributions to our understanding of electronic excitation energy transfer (EET) processes. There have been follow-up generalizations and extensions including Dexter's theory, but the basic physical assumption of incoherent quantum transition between localized centers under the Condon approximation of constant electronic coupling has persisted in almost all theoretical interpretation of EET processes.  However, recent experimental studies on photosynthetic light harvesting complexes and various organic molecules demonstrate that deviation from the prediction of FRET is significant if donor and acceptor are delocalized, if the Condon approximation breaks down, or if quantum coherence becomes important.  Theories addressing these issues, which were developed recently, are multichromophoric FRET (MC-FRET), inelastic FRET (I-FRET), coherent resonance energy transfer (CRET), multichromophoric CRET(MC-CRET), and inelastic CRET (I-CRET) theories.   The present talk introduces these theories and their applications to photosynthetic light harvesting complexes and organic molecules.

Post-Förster theories of resonance energy transfer for quantum delocalization, inelastic, and coherence effects

244th National Meeting (2012)

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