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A new forward-angle dispersion relation (DR) for electron-atom scattering is proposed. It is based on a subtraction of the static-exchange amplitude from the exact elastic scattering amplitude. Arguments are advanced to explain why this should obviate the difficulties associated with the Gerjuoy-Krall DR specifically with the exchange Born-amplitude. The new DR is tested in the elastic energy range for e-H scattering and compared with the GKDR.
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Temkin et al. (1986) studied this question.
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