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Threshold Behaviour of Electron Impact lonisation Cross Sections for Rare Gas Atoms
Author(s) -
Lebius H.,
Koslowski H. R.,
Wiesemann K.,
Huber B. A.
Publication year - 1991
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19915030110
Subject(s) - atomic physics , ionization , physics , electron , ion , wannier function , nuclear physics , condensed matter physics , quantum mechanics
For electron energies from direct ionisation threshold up to several eV above cross sections for the production of He + , He 2+ , Ne + up to Ne 4+ , Kr 2+ , Kr 3+ and Xe 2+ up to Xe 4+ ions by single electron impact on atoms were measured. By a least square fit a power law was fitted to the cross sections. The exponents obtained by this procedure are compared with several models, i.e. a simple phase‐space calculation, the Wannier model considering interelectronic repulsion and a statistical approach similar to Russek's statistical energy deposition model. We find that especially ionisation of many‐electron atoms to high degrees of ionisation can not be described by the Wannier model, however, within the statistical approach.