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Electron-impact excitation and ionization cross sections for ground state and excited helium atoms |
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| Authors: | Yu. Ralchenko R.K. Janev T. Kato D.V. Fursa I. Bray F.J. de Heer |
| Affiliation: | a Atomic Physics Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8422, USA b Macedonian Academy of Sciences and Arts, P.O. Box 482, 91000 Skopje, Macedonia c National Institute for Fusion Science, Toki, Gifu-ken 509-52, Japan d The ARC Centre for Antimatter-Matter Studies, Murdoch University, 90 South Street, Murdoch, WA 6150, Australia e FOM Institute for Atomic and Molecular Physics, Amsterdam, The Netherlands |
| Abstract: | Comprehensive and critically assessed cross sections for the electron-impact excitation and ionization of ground state and excited helium atoms are presented. All states (atomic terms) with n 4 are treated individually, while the states with n 5 are considered degenerate. For the processes involving transitions to and from n5 levels, suitable cross section scaling relations are presented. For a large number of transitions, from both ground and excited states, convergent close coupling calculations were performed to achieve a high accuracy of the data. The evaluated/recommended cross section data are presented by analytic fit functions, which preserve the correct asymptotic behavior of the cross sections. The cross sections are also displayed in graphical form. |
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