Abstract
An optical-potential description is used to study the effects of post-collision interaction (PCI) following the near-threshold electron impact excitation of autoionising states in helium. After some drastic but intuitively plausible approximations to the exact expressions published by Nienhuis and Heideman (1976), a model is obtained which lends itself to practical calculations. Results have been obtained on: (i) angular momentum exchanges during PCI, (ii) angular distributions of ejected electrons and (iii) lineshapes of PCI structures in the excitation of Rydberg states. These results are in accordance with the intuitive picture of the PCI mechanism and are confirmed by the trend in the experimental observations.
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