Criteria for the rapid diffusion limit of fluorescence energy transfer

Kazuhiko Kinosita, Tsutomu Kouyama, Akira Ikegami

Research output: Contribution to journalArticle

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Abstract

Excitation energy transfer in a system where the spatial relationship between the donor and acceptor is not fixed generally leads to a nonexponential decay of donor fluorescence. A single-exponential decay, however, is expected as a limiting form when the diffusion of the donors and/or acceptors is sufficiently rapid. The exponential character at the rapid diffusion limit will greatly facilitate the analysis of experimental data. In this paper a theoretical framework is presented that allows the calculation of the criterion for the rapid diffusion limit. Explicit criteria are given for various donor-acceptor geometries, all for the case of energy transfer via the resonance interaction of the Förster type. The criteria, except for the cases of densely distributed acceptors under a wide surface, have a common form DτDa4/R0≫λ, where τD is the lifetime of donor fluorescence in the absence of acceptors, D is the sum of diffusion coefficients of the donor and acceptor, a is the distance of closest approach between the donor and acceptor, R 0 is the critical distance for energy transfer, and λ is a geometrical constant with a value less than one. Exponential decays are not easily obtained when acceptors are densely distributed under a wide surface. The results are compared with the criterion given earlier by Thomas et al. [D. D. Thomas, W. F. Carlsen, and L. Stryer, Proc. Natl. Acad. Sci. U.S.A. 75, 5746 (1978)]. Experimental aspects, such as the effect of heterogeneity in a sample, are also discussed.

Original languageEnglish
Pages (from-to)3273-3282
Number of pages10
JournalThe Journal of chemical physics
Volume86
Issue number6
Publication statusPublished - 1987
Externally publishedYes

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Energy transfer
Fluorescence
energy transfer
fluorescence
decay
Excitation energy
diffusion coefficient
life (durability)
Geometry
geometry
excitation
interactions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Kinosita, K., Kouyama, T., & Ikegami, A. (1987). Criteria for the rapid diffusion limit of fluorescence energy transfer. The Journal of chemical physics, 86(6), 3273-3282.

Criteria for the rapid diffusion limit of fluorescence energy transfer. / Kinosita, Kazuhiko; Kouyama, Tsutomu; Ikegami, Akira.

In: The Journal of chemical physics, Vol. 86, No. 6, 1987, p. 3273-3282.

Research output: Contribution to journalArticle

Kinosita, K, Kouyama, T & Ikegami, A 1987, 'Criteria for the rapid diffusion limit of fluorescence energy transfer', The Journal of chemical physics, vol. 86, no. 6, pp. 3273-3282.
Kinosita, Kazuhiko ; Kouyama, Tsutomu ; Ikegami, Akira. / Criteria for the rapid diffusion limit of fluorescence energy transfer. In: The Journal of chemical physics. 1987 ; Vol. 86, No. 6. pp. 3273-3282.
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