Sputtering of high-energy metal ions in keV heavy-ion surface collisions

Citation
B. Van Someren et al., Sputtering of high-energy metal ions in keV heavy-ion surface collisions, SURF SCI, 423(2-3), 1999, pp. 276-291
Citations number
28
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
SURFACE SCIENCE
ISSN journal
0039-6028 → ACNP
Volume
423
Issue
2-3
Year of publication
1999
Pages
276 - 291
Database
ISI
SICI code
0039-6028(19990310)423:2-3<276:SOHMII>2.0.ZU;2-Y
Abstract
Spectra of high-energy negative and positive metal ions sputtered from Cu(1 10) and Al(111) by keV noble-gas ions and measured at large recoil angles a re presented. We have identified the most important mechanisms that lead to sputtering at these high energies. A comparison with a model based on MARL OWE simulations and on the electron tunneling model shows that for Cu(110) a significant fraction of the high-energy sputtered particles leaves the su rface in a positive charge state. At the surface, the fraction of sputtered negative ions is two orders of magnitude smaller. On the outgoing trajecto ry most of the ions are neutralized by resonance neutralization. The rate f or neutralization of the positive ions has been found to be significantly h igher than for the negative ions. (C) 1999 Elsevier Science B.V. All rights reserved.