Near-threshold electron impact ionization of atomic hydrogen
- 14 May 1997
- journal article
- letter
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 30 (9) , L309-L315
- https://doi.org/10.1088/0953-4075/30/9/004
Abstract
Electron impact ionization of atomic hydrogen within the simplified S-wave model problem of Temkin and Poet is studied in the energy region between the ionization threshold and 5 eV excess energy. Three of the currently most accurate close-coupling approaches - the convergent close-coupling (CCC), the R-matrix with pseudo-states (RMPS) and the intermediate R-matrix (IERM) methods - are applied to this problem and the results are compared. It is found that the behaviour of the cross section in this energy region is closer to an threshold law than the dependence predicted by Temkin. Preliminary results for the full electron - hydrogen - atom ionization problem for the partial wave have been obtained which indicate that these methods may also be used to study threshold ionization processes involving complex atoms and ions.Keywords
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