Förster excitation transfer (dipole–dipole excitation transfer)

Also contains definitions of: critical quenching radius, \(r_{0}\)
A mechanism of @E02256@ 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 @O04322@ \(k_{D \rightarrow A}\) is given by: \[k_{D \rightarrow A} = \frac{K^{2}\ J\ 8.8\times 10^{-28}\ \text{mol}}{n^{4}\ \tau _{0}\ r^{6}}\] where \(K\) is an orientation factor, \(n\) the @R05240@ of the medium, \(\tau _{0}\) the @R05064@ of the donor, \(r\) the distance (cm) between donor (D) and acceptor (A), and \(J\) the @S05818@ (in coherent units \(\text{cm}^{6}\ \text{mol}^{-1}\)) between the @A00043@ of the acceptor and the @F02453@ spectrum of the donor. The critical quenching radius, \(r_{0}\), is that distance at which \(k_{D \rightarrow A}\) is equal to the inverse of the @R05064@.
See also:
Dexter excitation transfer
energy transfer (in photochemistry)
radiative energy transfer
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2243 [Terms] [Paper]