Ejection of Nanoclusters from Gold Nanoislet Layers by 38 keV Au Ions in the Elastic Stopping Mode
Abstract:Total absolute yields of the ejected gold were obtained regardless of the type of the particles are—atoms, clusters, nanoclusters,—as well as absolute yields of gold nanoclusters, from nanoislet gold targets under bombardment by monoatomic gold ions at 45° to the target surface with the energy 38 keV, i.e., in the "purely" elastic stopping mode −6 keV/nm up to the fluence of 4*1012 cm2. Three targets had gold nanoislets on the substrate surface: 2–12 nm; −18 nm; −35 nm, the most probable sizes being 7.1; 9.4; 17.5 nm respectively. The part of the surface area covered with gold was known. Total transfer of gold was determined by means of the neutron-activation analysis and decreased from 450 to 20 at/ion. The number of the ejected gold nanoclusters was determined using TEM and decreased from ∼0.06 to <0.01 per one 38 keV Au ion with the increase of the most probable sizes of the nanoislets on the target from 7.1 to 17.5 nm. The yields appeared to be surprisingly high, which is of scientific and practical importance. Tentative estimations were made using molecular dynamics simulations.
Document Type: Research Article
Publication date: 2009-07-01
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