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Impact of Short-Range Forces on Defect Production from High Energy Collisions
Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA..
Univ Tartu, Inst Technol, IMS Lab, EE-50411 Tartu, Estonia.;Los Alamos Natl Lab, Mat Sci & Technol Div, POB 1663, Los Alamos, NM 87544 USA..
Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA..
Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA..
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2016 (English)In: Journal of Chemical Theory and Computation, ISSN 1549-9618, E-ISSN 1549-9626, Vol. 12, no 6, 2871-2879 p.Article in journal (Refereed) PublishedText
Abstract [en]

Primary radiation damage formation in solid materials typically involves collisions between atoms that have up to a few hundred keV of kinetic energy. Dining these collisions, the-distance between two colliding atoms can approach 0.05 nm. At such small atomic separations, force fields fitted-to equilibrium properties tend to significantly underestimate the potential-energy-of the colliding dieter. To enable molecular dynamics simulations of high-energy collisions, it is common practice to use a screened Coulomb, force field to describe the interactions and to smoothly join this to the equilibrium force field at a suitable interatomic spacing. However, there is,no accepted standard method for choosing the parameters used in the joining process, and our results prove that defect production is sensitive to how the force field's are linked. A new procedure is presented that involves the use of ab initio calculations to,determine the magnitude and spatial dependence of the pair interactions at intermediate distances, along with systematic criteria for choosing the joining parameters. Results are presented for the case of nickel, which demonstrate the use and validity of the procedure.

Place, publisher, year, edition, pages
2016. Vol. 12, no 6, 2871-2879 p.
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Atom and Molecular Physics and Optics Physical Chemistry
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URN: urn:nbn:se:uu:diva-299736DOI: 10.1021/acs.jctc.5b01194ISI: 000378016000034PubMedID: 27110927OAI: oai:DiVA.org:uu-299736DiVA: diva2:949983
Available from: 2016-07-26 Created: 2016-07-26 Last updated: 2016-07-26Bibliographically approved

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Klintenberg, Mattias
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Materials Theory
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