Absolute total cross sections for electron-impact double ionization of He(1s2s3S) and He(1s2s2p4P)

  • Matthieu GénévriezEmail author
  • Pierre Defrance
  • Jozo J. Jureta
  • Xavier Urbain
Regular Article
Part of the following topical collections:
  1. Topical Issue: Many Particle Spectroscopy of Atoms, Molecules, Clusters and Surfaces (2018)


We report on the experimental determination of absolute, total cross sections for electron-impact double ionization of helium in its metastable 1s2s3S state and of the helium negative ion He(1s2s2p4P). Cross sections are measured for impact energies ranging from threshold to 1000 eV using the animated crossed beams technique. The fast, pure beam of metastable helium required for the experiment is produced by photodetachment of fast He ions. Results for He(1s2s3S) are compared to those for He(1s21S), and exhibit similar magnitude and behaviour. The cross section for He is large compared to other negative ions and indicates the predominance of indirect ionization channels at large impact energies.

Graphical abstract


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© EDP Sciences, SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Condensed Matter and Nanosciences, Université catholique de LouvainLouvain-la-Neuve 1348Belgium

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