Numerical comparison of the Kohn and Schwinger variational methods with Ladanyi's approach for potential scattering

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Abstract
The Kohn and Schwinger variational methods are applied to electron scattering by local spherical potentials and the numerical results are compared with those of Ladanyi's method (1970) based on the standard form of the Schrodinger equation. Both the stability and the convergence of the results are carefully analysed and, in the case of Ladanyi's method, the measure of the error of the approximate solution is investigated as well. The analysis implies that Ladanyi's method is competitive in comparison with the standard variational procedures.