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Title: Sputtering at grazing ion incidence: Influence of adatom islands

When energetic ions impinge at grazing incidence onto an atomically flat terrace, they will not sputter. However, when adatom islands (containing N atoms) are deposited on the surface, they induce sputtering. We investigate this effect for the specific case of 83 deg. -incident 5 keV Ar ions on a Pt (111) surface by means of molecular-dynamics simulation and experiment. We find that - for constant coverage {Theta} - the sputter yield has a maximum at island sizes of N congruent with 10-20. A detailed picture explaining the decline of the sputter yield toward larger and smaller island sizes is worked out. Our simulation results are compared with dedicated sputtering experiments, in which a coverage of {Theta}=0.09 of Pt adatoms are deposited onto the Pt (111) surface and form islands with a broad distribution around a most probable size of N congruent with 20.
Authors:
 [1] ;  [2] ; ;  [3] ;  [1]
  1. Fachbereich Physik und Forschungszentrum OPTIMAS, Universitaet Kaiserslautern, Erwin-Schroedinger-Strasse, D-67663 Kaiserslautern (Germany)
  2. (Indonesia)
  3. II. Physikalisches Institut, Universitaet Koeln, Zuelpicherstrasse 77, D-50937 Koeln (Germany)
Publication Date:
OSTI Identifier:
21421431
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 82; Journal Issue: 12; Other Information: DOI: 10.1103/PhysRevB.82.125440; (c) 2010 The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ARGON IONS; ATOMIC CLUSTERS; ATOMS; CRYSTAL DEFECTS; DISTRIBUTION; ION-ATOM COLLISIONS; KEV RANGE 01-10; MOLECULAR DYNAMICS METHOD; PLATINUM; SIMULATION; SPUTTERING; SURFACES; TAIL IONS ATOM COLLISIONS; CALCULATION METHODS; CHARGED PARTICLES; COLLISIONS; CRYSTAL STRUCTURE; ELEMENTS; ENERGY RANGE; ION COLLISIONS; IONS; KEV RANGE; METALS; PLATINUM METALS; TRANSITION ELEMENTS