Europhys. Lett.
Volume 62, Number 5, June 2003
Page(s) 739 - 745
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 May 2003
DOI: 10.1209/epl/i2003-00435-1
Europhys. Lett., 62 (5) , pp. 739-745 (2003)

Classical model of kinetic electron emission near threshold induced by impact of atomic projectiles on a free-electron gas metal

H. Winter1 and H. P. Winter2

1  Institut für Physik der Humboldt-Universität zu Berlin Invalidenstraße 110, D-10115 Berlin, Germany
2  Institut für Allgemeine Physik der Technischen Universität Wien Wiedner Hauptstr. 6-10, A-1040 Wien, Austria

(Received 21 October 2002; accepted in final form 1 April 2003)

We present a simple classical model for the threshold behaviour of the kinetic electron emission caused by collisions of atomic projectiles with a metal. Electron emission close to threshold is dominated by maximum energy transfer in binary collisions and from conservation laws and phase space considerations we derive the threshold behaviour for the kinetic electron emission and the mean electron energy transfer, which compare well with recent experimental studies on electron emission from $\chem{Al(111)}$ under grazing impact of light neutral atoms.

79.20.Rf - Atomic, molecular, and ion beam impact and interactions with surfaces.
79.60.Bm - Clean metal, semiconductor, and insulator surfaces.
61.85.+p - Channeling phenomena (blocking, energy loss, etc.).

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