Article (Scientific journals)
Influence of a single adatom on sputtering at grazing incidence - A molecular-dynamics case study of 5 keV Ar impact on Pt (111)
Rosandi, Yudi; Redinger, Alex; Michely, Thomas et al.
2009In Surface Science, 603 (2), p. 320-325
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Abstract :
[en] Grazing incidence ion impact on a flat terrace lets the projectile reflect specularly off the surface, leading to little or no damage production or sputtering. The presence of isolated surface defects may change this behaviour drastically. We investigate this phenomenon for the specific case of 5 keV Ar ions impinging at 83 degrees towards the surface normal onto the Pt (111) surface. Molecular-dynamics simulations allow to study the influence of isolated adatoms in detail. The scattering of the projectile from the adatom can redirect the projectile, or let the adatom recoil, such that either of them deposits considerable energy in the target surface, leading to abundant damage production and sputtering. Two distinct collision zones are identified: (i) When the projectile hits the surface in front of the adatom, it may collide with the adatom indirectly (after being specularly reflected off the surface); (ii) alternatively, it may hit the adatom directly. We quantify our results by measuring the zone of influence (congruent to 13 angstrom(2)) around the adatom, into which the projectile must hit in order to collide with the adatom, and by the sputter cross section of roughly 110 angstrom(2). The data compare well with previous simulation results of sputtering from an atomically rough surface. (C) 2008 Elsevier B.V. All rights reserved.
Disciplines :
Physics
Author, co-author :
Rosandi, Yudi
Redinger, Alex ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Michely, Thomas
M., Urbassek Herbert
External co-authors :
yes
Language :
English
Title :
Influence of a single adatom on sputtering at grazing incidence - A molecular-dynamics case study of 5 keV Ar impact on Pt (111)
Publication date :
2009
Journal title :
Surface Science
ISSN :
0039-6028
Publisher :
Elsevier, Netherlands
Volume :
603
Issue :
2
Pages :
320-325
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
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