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Förster excitation transfer (dipole–dipole excitation transfer)

Also contains definition of: critical quenching radius, r 0

A mechanism of excitation transfer which can occur between molecular entities separated by distances considerably exceeding the sum of their van der Waals radii. It is described in terms of an interaction between the transition dipole moments (a dipolar mechanism). The transfer rate constant k D → A is given by:
k D → A = K 2 J 8.8 × 10 −28 mol n 4 τ 0 r 6
where K is an orientation factor, n the refractive index of the medium, τ 0 the radiative lifetime of the donor, r the distance (cm) between donor (D) and acceptor (A), and J the spectral overlap (in coherent units cm 6 mol −1) between the absorption spectrum of the acceptor and the fluorescence spectrum of the donor. The critical quenching radius, r 0, is that distance at which k D → A is equal to the inverse of the radiative lifetime.
Source:
PAC, 1996, 68, 2223 (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2243
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.F02488.
Original PDF version: http://www.iupac.org/goldbook/F02488.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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