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Displaced Electron Energies and the "Shake-Down" Effect

F. H. Read
Radiation Research
Vol. 64, No. 1, Symposium on the Distribution of Secondary Electrons from Ionizing Collisions (Oct., 1975), pp. 23-36
DOI: 10.2307/3574166
Stable URL: http://www.jstor.org/stable/3574166
Page Count: 14
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Displaced Electron Energies and the "Shake-Down" Effect
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Abstract

A brief review is given of the apparent exchanges of energy that can occur sometimes between the outgoing particles in electron-atom impact experiments, when these final particles consist of two electrons receding from a positive ion, and when the incident electron energy is near the energy of an autoionizing state of the target atom. These energy exchanges manifest themselves as changes in the energies of electrons ejected from autoionizing states of atoms excited by near-threshold electron impact, displacements of the thresholds for exciting autoionizing states, and structure in the cross sections for exciting Rydberg states of neutral atoms by electron impact at incident energies in the vicinity of autoionizing states. The experimental evidence for these processes is reviewed and qualitative explanations are given. Evidence for analogous effects in other scattering and absorption processes is also discussed.

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