Electron tunneling accompanied by the emission or absorption of light

Electron tunneling accompanied by the emission or absorption of light 

In the previous sections we considered the processes of non-radiative electron tunneling. Along with them, processes are possible when, in the course of one elementary act, the electron tunnels from a donor to an acceptor and simultaneously radiates a quantum of light [7]. Using the 

This is the coefficient of absorption rather than the absorption cross-section that is usually measured in the experiments. These two quantities are related by the equation 

We have considered direct electron tunneling from a donor to an acceptor under the influence of radiation. Along with this some indirect processes of electron tunneling with the participation of light are possible. For instance, the absorption of light may result in the excitation of the donor 

Unlike process (74), the electron in process (75) tunnels with an energy which is less than IA by the energy of the excitation transferred. 

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