Förster excitation transfer (dipole–dipole excitation transfer)

Also contains definitions of: critical quenching radius, r0
https://doi.org/10.1351/goldbook.F02488
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
kDA is given by: kDA=K2J8.8×1028 moln4τ0r6 where K is an orientation factor, n the
refractive index
of the medium, τ0 the
radiative lifetime
of the donor, r the distance (cm) between donor (D) and acceptor (A), and J the
spectral overlap
(in coherent units cm6mol1) between the
absorption spectrum
of the acceptor and the
fluorescence
spectrum of the donor. The critical quenching radius, r0, is that distance at which kDA is equal to the inverse of the
radiative lifetime
.
See also:
Dexter excitation transfer
,
energy transfer (in photochemistry)
,
radiative energy transfer
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2243 [Terms] [Paper]