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Experimental and Theoretical Investigations on the Interrelation of Charge Exchange Processes and Energy Loss of Particles at Metal Surfaces

Published online by Cambridge University Press:  16 February 2011

A. NÄrmann ,
W. Heiland ,
R. Monreal ,
F. Flores  and
P. M. Echenique
A. NÄrmann
Affiliation:
Universität Osnabrück, Fachbereich Physik, W-4500 Osnabrück, Germany
W. Heiland
Affiliation:
Universität Osnabrück, Fachbereich Physik, W-4500 Osnabrück, Germany
R. Monreal
Affiliation:
Universidad Autónoma de Madrid, Dept. de la Materia Condensada, Cantoblanco, E-28049 Madrid, Spain
F. Flores
Affiliation:
Universidad Autónoma de Madrid, Dept. de la Materia Condensada, Cantoblanco, E-28049 Madrid, Spain
P. M. Echenique
Affiliation:
Euskal Herriko Univertsitatea, Kimika Fakultatea, Apdo. 1072, E-20080 San Sebastión, Spain
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Abstract

We present experiments and a theoretical model for the energy loss distribution of specularly reflected particles after slow (2-5 keV) He ions have been impinging on a Ni(110) surface under grazing incidence. The energy spectra of the backscattered particles are asymmetric with the low-energy tail falling off more slowly than the high-energy tail does.

This asymmetry is accounted for by considering charge exchange events during the interaction with the surface. The main neutralization channel for this system is the Auger-neutralization from the conduction band into the He-1s ground state. The transition rate for this process was calculated from first principles. Assuming that the ‘friction coefficient’ for the system particle-surface depends on the charge state of the particle, we calculate the energy lost by a particle during the interaction as a sum of different contributions belonging to different charge states.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 223: Symposium E – Low Energy Ion Beam and Plasma Modification of Materials , 1991 , 47
Copyright
Copyright © Materials Research Society 1991

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References

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