Resonance Scattering of Fast Electrons in a Single Crystal

It is shown that resonance scattering of fast ($pL>>pR>>1$, $p$ is the particle momentum, $L$ is the longitudinal dimension of the potential, and $R$ is its transverse dimension) charged particles occurs in the extended potential. The data on small-angle scattering of fast electrons in the crystal are interpreted on the basis of the examined effect.