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Simulating cluster-ion impacts

Tombrello, T. A. (1998) Simulating cluster-ion impacts. In: Similarities and differences between atomic nuclei and clusters : toward a unified development of cluster science. AIP conference proceedings. No.416. American Institute of Physics , Woodbury, NY, pp. 378-385. ISBN 9781563967146. http://resolver.caltech.edu/CaltechAUTHORS:20141017-145429770

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Abstract

Although cluster-ion interactions may superficially appear to resemble those in nuclear physics, there are important differences. First, at the energies of interest the deBroglie wavelength of an atom in the cluster is so short compared to atomic dimensions that the atom’s trajectory in a solid is classical. Thus, one may use the Born-Oppenheimer approximation in which the particles all obey Newton’s equations of motion and only the interaction potentials reflect the quantum mechanical character of the system. Thus, we can treat many atomic interaction processes in the semi-classical limit; in this paper I shall, for example, indicate how in this way one can include the effect of atomic excitation in collisions. Second, the cross sections involved are much larger than those for nuclear interactions, i.e., the mean free paths of the “reaction products” are so short that large collective effects always occur. This means that the calculations must deal with large numbers of interacting particles. For the case of cluster ions at MeV energies this has required us to develop new computational strategies, e.g., the use of massively parallel computers. By using such simulations strategically we are able both to optimize the design of experiments and to interpret their results less ambiguously.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.54524DOIArticle
http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.54524PublisherArticle
Additional Information:© 1998 American Institute of Physics. Published online 20 June 1997. I gratefully acknowledge the contributions to the simulation program described herein by my colleague, Mark Shapiro, and our student, John Hartman. The experimental inspiration has come from Y. Le Beyec, S. Della-Negra, Bo Sundqvist, and P. Hakansson. Support from the NSF [grant DMR93-18931], LLNL [subcontract B295137 of the DOE contract W-7405-ENG48], the Concurrent Superconducting Consortium at Caltech, and the Caltech's Ph11 undergraduate program made this work possible.
Funders:
Funding AgencyGrant Number
NSFDMR93-18931
Lawrence Livermore National Laboratory (LLNL)B295137
Department of Energy (DOE)W-7405-ENG48
Caltech Concurrent Superconducting ConsortiumUNSPECIFIED
Record Number:CaltechAUTHORS:20141017-145429770
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141017-145429770
Official Citation:Simulating cluster-ion impacts Tombrello, T. A., AIP Conference Proceedings, 416, 378-385 (1997), DOI:http://dx.doi.org/10.1063/1.54524
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50507
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Oct 2014 15:49
Last Modified:20 Oct 2014 15:49

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