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Simulation of cluster ejection following high-energy Au_n→Au(111) bombardment

Shapiro, M. H. and Tombrello, T. A. (2000) Simulation of cluster ejection following high-energy Au_n→Au(111) bombardment. Surface Science, 453 (1-3). pp. 143-151. ISSN 0039-6028. doi:10.1016/S0039-6028(00)00333-2.

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Following the recent report by Andersen et al. of extremely large nonlinear sputtering yields caused by the bombardment of gold targets with small, high energy gold clusters [Phys. Rev. Lett. 80 (1998) 5433], we carried out simulations showing: (1) that the thermal spike phase of the collision cascade contributes significantly to these nonlinear yields; and (2) that individual ‘mega-events’ with yields up to ∼2500 contribute significantly to the total sputtering yields [Shapiro and Tombrello, Nucl. Instrum. Meth. B 152 (1999) 221]. Here we extend our simulations to examine the cluster component of the sputtering yield. We find that clusters with n≥2 constitute a large fraction of the yield. In the early stages of sputtering (≤3 ps) clusters with as many as ∼800 atoms are ejected. These very large clusters are not stable; however, after allowing the simulations to evolve for an additional 100 ps, clusters with as many as ∼300 atoms remain. The yields of clusters with n ≤∼10 follow typical power law distributions, while the yield of clusters with n>∼10 significantly exceed the predictions of the power-law distribution. Our simulations also show that clusters with more than a few tens of atoms are emitted exclusively during the thermal spike phase.

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Additional Information:© 2000 Elsevier Science B.V. Received 27 September 1999; accepted for publication 25 January 2000. This work was supported in part by the National Science Foundation (Grants DMR-9712538 at Cal State Fullerton and DMR-9730893 at Caltech). The authors gratefully acknowledge the assistance of Josh Soneson and Deanna Smith, who prepared the computer animations.
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Subject Keywords:atomistic dynamics; computer simulations; gold; ion-solid interactions; molecular dynamics; sputtering
Issue or Number:1-3
Record Number:CaltechAUTHORS:20141017-135041569
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Official Citation:M.H. Shapiro, T.A. Tombrello, Simulation of cluster ejection following high-energy Aun→Au(111) bombardment, Surface Science, Volume 453, Issues 1–3, 10 May 2000, Pages 143-151, ISSN 0039-6028, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50499
Deposited By: Tony Diaz
Deposited On:20 Oct 2014 15:59
Last Modified:10 Nov 2021 18:56

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