Fragmentation of clusters sputtered from silver and gold: Molecular dynamics simulations
2005 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 71, no 1Article in journal (Refereed) Published
Using molecular dynamics simulations and the embedded atom method (EAM) potential we have investigated the sputtered atom clusters produced by 15 keV xenon impacts on silver and 20 keV xenon impacts on gold. Ejected clusters were simulated for long times, up to 0.01-1 mus, in order to investigate the fragmentation of nascent clusters. The size distributions of nascent and final clusters were calculated and fitted to an inverse power law, resulting in exponents close to 2 and 3, depending on the range of the cluster sizes used. These values are in agreement with other simulations and experiments. The results show that clusters are subject to a dramatic breakup, which makes the size of the largest sputtered cluster go down by a factor of 2-4. Despite this, the exponent in the power law does not change very much from the size distribution of nascent to that of final clusters. Considering the uncertainties, the exponent of the final size distribution is 1.0-1.7 times the exponent of the nascent size distribution.
Place, publisher, year, edition, pages
2005. Vol. 71, no 1
metal-clusters, fcc metals, emission, nanoparticles, nanoclusters, coalescence, bombardment, energy, au
IdentifiersURN: urn:nbn:se:kth:diva-14491DOI: 10.1103/PhysRevB.71.014117ISI: 000226735100060OAI: oai:DiVA.org:kth-14491DiVA: diva2:332532
QC 201005252010-08-052010-08-05Bibliographically approved