Physical Process
Tunneling Ionization is a QM phenomenon; a non-zero probability event for observing a particle escaping from the deformed Coulomb potential barrier, obviously this phenomenon is forbidden by classical laws, as in the classical picture an electron does not have sufficient energy to escape.
As the Coulomb potential barrier is lowered, its width decreases, and this in turn increases the probability of electron tunneling through the barrier. The ADK probability formula gives the expression for the probability of tunnel ionization.
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