Publisher's Synopsis
Excerpt from A Perturbation Calculation of the Elastic Scattering of Electrons by Hydrogen Atoms
If the mass of the proton is taken to be infinite, one can, as an alterna -tive, take as the perturbation simply the interaction between the two electrons. (this we call the symmetric In this case the unperturbed hamiltonian is separable and the initial and final state wave functions corres ponding to it can be exhibited in closed form.
This latter procedure is likely to lead to more accurate results than the former, since we include more of the interaction in our unperturbed problem.
This advantage will be most pronounced in the calculation of exchange scattering.
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