Dexter electron transfer

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Dexter electron transfer is a method for an excited electron state to transfer from one molecule (the donor) to a second (the acceptor). This requires a wavefunction overlap between the donor and acceptor, so can only occur at short distances; typically of the order 15-20A. The excited state may be exchanged in a single step, or in two separate charge exchange steps.

The Dexter energy transfer rate, kET, is proportional to the expression:

k_{ET} \varpropto J \mathrm{exp}\left [ \frac{-2r}{L} \right ]

Where r is the separation of the donor from the acceptor, L is the sum of the van-der Waals radii of the donor and the acceptor and J is the spectral overlap integral:

J = \int f_{\rm D}(\lambda) \, \epsilon_{\rm A}(\lambda) \, \lambda^4 \, d\lambda

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