Neutralization of Ions and Ionization of Atoms Near Metal Surfaces

Autor:	Jr L. J. Varnerin
Rok vydání:	1953
Předmět:	Materials science Metastability Ionization Secondary emission Atom General Physics and Astronomy Physics::Atomic Physics Electron Atomic physics Type (model theory) Molecular physics Secondary electrons Ion
Zdroj:	Physical Review. 91:859-863
ISSN:	0031-899X
DOI:	10.1103/physrev.91.859
Popis:	Conditions are examined for the resonance transfer of an electron between a metal and an ion or an atom in close proximity to the surface. The point of view is that of Franck-Condon crossings of potential energy curves of the initial and final states of the system. The effect of ion image forces is found in many cases to cause a significant variation of transition probability with distance. As a result, the conditions for neutralization of a rare gas ion to a metastable state and its subsequent de-excitation with the ejection of a secondary electron is found to be severely restricted. In particular, the theory of Cobas and Lamb for the ejection of electrons by the incidence of ${\mathrm{He}}^{+}$ on a Mo surface are found to be seriously in error. In such cases an Auger type de-excitation is believed to be the mechanism for secondary electron emission.
Databáze:	OpenAIRE
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