Electron tunneling in reactions of excited organic molecules

2 ELECTRON TUNNELING IN REACTIONS OF EXCITED ORGANIC MOLECULES 

Owing to a relatively high (compared with molecules in the ground electron state) probability of electron tunneling for excited molecules, this process, at sufficiently short distances between the excited molecules and the particles of electron acceptors, can compete with the ordinary over-barrier electron transfer (see the scheme in Fig. 9). In practice this effect manifests itself in the transition, as the concentration of acceptor rises, from the usual 

1 Kinetics of photo-induced electron tunneling from naphthalene to CCl4 

The decay kinetics of excited electron donor molecules (the intensity of fluorescence is proportional to the concentration of excited molecules at any given time) can be interpreted in two ways. First, one may try to approxi- 

The other interpretation is based on the idea of electron tunneling from excited molecules. In this instance there occurs an overlap of the exponential decay at a rate constant k0 which refers to spontaneous deactivation of the Nh molecules from the excited to the ground state and of the logarithmic kinetics characteristic of electron tunneling reactions (cf. Chap. 4, Sect. 2) 

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