Abstract
The theory of exchange scattering of an electron by an atom given by Mott and Massey is discussed. A new formulation of an approximate treatment of the problem is suggested that leads to a system of differential integral equations similar to the Fock equations for the discrete state of atoms. This method leads to Oppenheimer's result as a first approximation. The resonance scattering arising from the inverse process of auto-ionization (Auger effect) is treated in a phenomenological manner.

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