Slow Electrons Ejected from He by Fast Charged Particles
- 1 April 1973
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 7 (4), 1257-1260
- https://doi.org/10.1103/physreva.7.1257
Abstract
An accurate differential ionization cross section for the ejection of zero-kinetic-energy electrons from He by fast charged particles is deduced by extrapolating the Born cross sections for discrete excitations, in the spirit of the quantum-defect theory. Recent electron-impact data by Grissom et al. for secondary electrons of almost zero kinetic energy are in excellent agreement with the theory. The electron-impact data by Peterson et al. for slow secondary electrons show trends consistent with the theory also. The proton-impact data by Rudd et al. are in better agreement with the theory than those by Stolterfoht.Keywords
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