Volume 54, Number 5, June 2001
|Page(s)||633 - 639|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 December 2003|
Electron emission by Doppler-mediated formation of doubly excited in grazing incidence of protons on clean
J. Heyrovsky Institute of Physical Chemistry,
Academy of Sciences of the Czech Republic -
Dolejskova 3, 18223 Praha, Czech Republic
2 Institute of Radio Engineering and Electronics, Academy of Sciences of the Czech Republic - Chaberská 57, 18251 Praha, Czech Republic
3 Institut für Allgemeine Physik, TU Wien Wiedner Hauptstrasse 8-10, A-1040 Wien, Austria
Accepted: 16 March 2001
We present a new electron emission process which may give rise to a structure in electron energy distributions observed for grazing incidence of protons on atomically clean . It is conjectured that the formation of doubly excited negative hydrogen ions from the Doppler-shifted surface-density-of-states results in autodetached electrons which are scattered and diffracted at the monocrystalline surface. This scenario is a modification of a recently suggested model which assumed electron production from elastic collisions of projectiles with the free-electron gas at the surface and diffraction upon escape into vacuum. The here proposed process should be most significant for hydrogen projectiles with comparably low energy (< 10 ).
PACS: 68.49.Sf – Ion scattering from surfaces (charge transfer, sputtering, SIMS) / 79.20.Rf – Atomic, molecular, and ion beam impact and interactions with surfaces
© EDP Sciences, 2001
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