Shapiro, M. H. and Tombrello, T. A. (1991) Molecular dynamics simulations of energetic cluster impacts on Al, Cu and Au targets. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 58 (2). pp. 161-173. ISSN 0168-583X. doi:10.1016/0168-583X(91)95582-X. https://resolver.caltech.edu/CaltechAUTHORS:20141029-115235072
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Abstract
Energy, number-density, confinement-time and ejected-atom properties of cluster impacts on metallic surfaces for the Al_(63)−Al, Cu_(63)-Cu, Al_(32)-Au and Al_(63)-Au systems with incident cluster energies of 1 keV/atom have been investigated by molecular-dynamics simulation. Similar simulations have been carried out for composite clusters (38 Al atoms, 25 Au atoms) impacting gold targets. Inertial confinement of the incoming clusters leads to number-density increases of ∼ 2 for very short time periods (< 20 fs) in the primary impact zone. Multiple collision processes occasionally increase the potential energy of a particle to several times the value allowed in isolated two-body collisions. However, these effects are not sufficient to explain recent cluster impact fusion data. Significant numbers of aluminum atoms are found to eject from incoming clusters upon impact with the target for the Al_(63)-Au, Al_(63)-Au and composite cluster-Au systems. Energy- and angle-distributions of sputtered target-atoms are consistent with relatively rapid amorphization of the single crystal targets used in the simulations.
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| Additional Information: | © 1991 Elsevier Science Publishers B.V. Received 3 October 1990 and in revised form 11 January 1991. Supported in part by NSF grant DMR-8615641 at Caltech and by NSF grant DMR-9002532 at CSUF. The authors wish to thank the Hewlett-Packard Corporation for the loan of the Apollo 10020 workstation used for the majority of these simulations. We also wish to thank Dr. S. Franklin of the University of California, Irvine for making available an IBM 6000 workstation for some of the calculations. | |||||||||
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| Issue or Number: | 2 | |||||||||
| DOI: | 10.1016/0168-583X(91)95582-X | |||||||||
| Record Number: | CaltechAUTHORS:20141029-115235072 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20141029-115235072 | |||||||||
| Official Citation: | M.H. Shapiro, T.A. Tombrello, Molecular dynamics simulations of energetic cluster impacts on Al, Cu and Au targets, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 58, Issue 2, 1 June 1991, Pages 161-173, ISSN 0168-583X, http://dx.doi.org/10.1016/0168-583X(91)95582-X. (http://www.sciencedirect.com/science/article/pii/0168583X9195582X) | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 51004 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Ruth Sustaita | |||||||||
| Deposited On: | 29 Oct 2014 20:58 | |||||||||
| Last Modified: | 10 Nov 2021 19:04 |
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