Validity of dispersion relations for electron-atom scattering
- 1 July 1977
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 16 (1) , 163-168
- https://doi.org/10.1103/physreva.16.163
Abstract
This paper summarizes the usual assumptions made in applying dispersion relations to electron-atom scattering. It is shown that in the static exchange approximation, electron exchange gives rise to a third-order pole, and the position and strength of this pole are calculated. It is then argued that this singularity is a feature of the exact scattering amplitude. Finally a numerical study is carried out which confirms the existence of additional left-hand singularities.Keywords
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