Molecular-dynamics simulations of collisions between energetic clusters of atoms and metal substrates

Journal Article · Sat Feb 15 00:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.45.4417· OSTI ID:7205770

Hsieh, H; Averback, R S ^[1]; Sellers, H ^[2]; Flynn, C P ^[3]

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1. Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
2. National Center for Supercomputing Applications, Beckman Institute for Advanced Science and Technology, University of Illinois, Urbana, Illinois 61801 (United States)
3. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)

The collisional dynamics between clusters of Cu, Ni, or Al atoms, with energies of 92 eV to 1.0 keV and sizes of 4 to 92 atoms, and substrates of these same metals were studied using molecular-dynamics computer simulations. A diverse behavior was observed, depending sensitively on the size and energy of the cluster, the elastic and chemical properties of the cluster-substrate combination, and the relative mass of the cluster and substrate atoms. For the 92-atom Cu clusters impacting a Cu substrate, the cluster can form a glob'' on the surface at low energy, while penetrating the substrate and heavily deforming it at high energies. When the cluster energy exceeds {approx}25 eV/atom, the substrate suffers radiation damage. The 92-atom Al clusters do not much deform Ni substrates, but rather tend to spread epitaxially over the surface, despite the 15% lattice mismatch. For 1-keV collisions, several Al atoms dissociate from the cluster, either reflecting into the vacuum or scattering over the surface. 326-eV Ni clusters embed themselves almost completely within Al substrates and form localized amorphous zones. The potentials for these simulations were derived from the embedded-atom method, although modified to treat the higher-energy events. IAb initioP linear-combination-of-atomic-orbitals--molecular-orbitals calculations were employed to test these potentials over a wide range of energies. A simple model for the expected macroscopic behavior of cluster-solid interactions is included as an appendix for a comparison with the atomistic description offered by the simulations.

• OSTI ID: 7205770
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 45:8; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ATOM COLLISIONS
COMPUTERIZED SIMULATION
CLUSTER BEAMS
METALS
ALUMINIUM
COPPER
KEV RANGE 01-10
LCAO METHOD
NICKEL
BEAMS
COLLISIONS
ELEMENTS
ENERGY RANGE
KEV RANGE
SIMULATION
TRANSITION ELEMENTS
665300* - Interactions Between Beams & Condensed Matter- (1992-)