Abstract
The Schwinger variational method for three-body collisions is applied to the calculation of elastic scattering of electrons by hydrogen atoms in the energy range 0-10 volts. When a Born trial field is used, the contributions of the ground state and all the excited states including the continuum can be calculated. The former contribution is equivalent to the static field approximation and the latter contributions give the corrections to it. When these are included, the results do not agree with those of Massey and Moiseiwitsch who use a different approximation. We conclude that the Schwinger variational method with a Born trial field is unsatisfactory in this energy range.
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