Wigner used the stationary phase approximation to show that it can occur at superluminal speeds.
A relativistic treatment of this phenomenon gives startling predictions in the case of an overcritical potential, a fact related to pair production in the Klein paradox. Wigner used the stationary phase approximation to show that it can occur at superluminal speeds. Gurney, Condon and Gamow used a simple treatment of this phenomenon to calculate the energy dependence of alpha decay half-life using a decaying exponential to model the associated wave function inside the Coulomb barrier. FTP, name this phenomenon in which a particle incident on a classically-forbidden potential barrier has a non-zero probability to leak through.
A relativistic treatment of this phenomenon gives startling predictions in the case of an overcritical potential, a fact related to pair production in the Klein paradox.
{tunneling}