Regularities of Photoinduced Tunnel Electron Transfer Processes

1 Regularities of Photoinduced Tunnel Electron Transfer Processes 

The following regularities of electron tunneling in primary and secondary processes of PET can be mentioned. 

2) The main feature of electron tunneling is that it can provide the occurrence of both primary and secondary reactions of PET between remote electron donor and electron acceptor sites, at distances sometimes as great as several tens of Angstroms. 

3) PET via electron tunneling mechanism can take place both from the excited donor to the non-excited acceptor and from the non-excited donor to the excited acceptor. An example of the process of the latter type was given in Sect. 2.2. 

4) The dependence of the probability of electron tunneling in PET reactions on the distance R between the reagents can be well discribed by a simple exponential law W = veexp(—2R/ae). This law is suggested by the theory and allows us to describe quantitatively all the experimental data available so far. 

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