Abstract
It is well known that separable approximations of non-local exchange forces represent a very efficient technique for solving electron-atom and electron-molecule scattering problems. The authors combine this technique with the application of Lanczos sigma factors. This combination was proposed recently in the field of nuclear physics and proved to be fairly efficient for simple local potentials. It is shown, using the example of low-energy electron-hydrogen-atom elastic scattering that the introduction of Lanczos sigma factors may improve the convergence but the effect is not as strong as in the nuclear physics case.
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