Dexter electron transfer is a quenching mechanism in which an excited electron state transfers from one molecule (a donor) to a second molecule (an acceptor). This process requires a wavefunction overlap between the donor and acceptor, which means it can only occur at short distances; typically of the order 15-20 Å. The excited state may be exchanged in a single step, or in two separate charge exchange steps.
The Dexter energy transfer rate, is indicated by the proportionality
where is the separation of the donor from the acceptor, is the sum of the Van der Waals radii of the donor and the acceptor, and is the spectral overlap integral defined by
Famous quotes containing the word transfer:
“I have proceeded ... to prevent the lapse from ... the point of blending between wakefulness and sleep.... Not ... that I can render the point more than a pointbut that I can startle myself ... into wakefulnessand thus transfer the point ... into the realm of Memoryconvey its impressions,... to a situation where ... I can survey them with the eye of analysis.”
—Edgar Allan Poe (18091849)