Förster energy transfer from nonexponentially decaying donors

Agnieszka Czuper, Ignacy Gryczynski, Józef Kuśba

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5 Scopus citations


Necessary modifications to the expression for the Förster energy transfer rate are discussed when fluorescence decay of the donor in the absence of acceptor is nonexponential. Discrete and continuous models of the nonexponentiality are taken into account. No general solution of the problem is found. It is, however, suggested that in many of the biochemical problems the most appropriate modification of the transfer rate can be that which is based on the assumption of the same constant value of the radiative decay rate for all donor molecules. The effect of the assumed form of the Förster energy transfer rate on the recovered values of the distance distribution and dynamics parameters of some exemplary bichromophoric systems is examined.

Original languageEnglish
Pages (from-to)200-208
Number of pages9
JournalJournal of Photochemistry and Photobiology B: Biology
Issue number3
StatePublished - 26 Jun 2007


  • Nonexponential fluorescence decay
  • Resonance energy transfer
  • Transfer rate


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