Frster excitation transfer dipoledipole excitation transfer A mechanism of excitation transfer which can occur between molecular entities separated by distances considerably exceeding the sum of thei
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Frster excitation transfer dipoledipole excitation transfer A mechanism of excitation transfer which can occur between molecular entities separated by distances considerably exceeding the sum of thei

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Frster excitation transfer dipoledipole excitation transfer A mechanism of excitation transfer which can occur between molecular entities separated by distances considerably exceeding the sum of thei




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Presentation on theme: "Frster excitation transfer dipoledipole excitation transfer A mechanism of excitation transfer which can occur between molecular entities separated by distances considerably exceeding the sum of thei"— Presentation transcript:


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Förster excitation transfer (dipole–dipole excitation transfer) 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 con- stan t D A is given by: D A 8.8 10 28 mol wher e is an orientation factor, the refractive index of the medium, the radiative lifetime of the donor, the distance (cm) between donor (D) and acceptor (A), an d the spectral overlap (in coherent units cm mol –1 between the absorption spectrum of the acceptor and the fluorescence spectrum of the donor. The critical quenching radius, , is that distance at whic h D A is equal to the inverse of the radiative lifetime. See also Dexter excitation transfer, energy transfer, radiative energy transfer. 1996, 68 , 2243 IUPAC Compendium of Chemical Terminology 2nd Edition (1997)