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Desorption of gold nanoclusters from gold nanodispersed targets by 200 keV Au5 polyatomic ions in the elastic stopping mode: Experiment and molecular-dynamics simulation |
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| Authors: | C Anders S Della-Negra M Fallavier V Obnorsky S Yarmiychuk HM Urbassek |
| Affiliation: | a Universität Kaiserslautern, Physics Department, Erwin-Schrödinger-Strasse, 67663, Kaiserslautern, Germany b V.G. Khlopin Radium Institute, 2nd Murinskii Ave. 28, 194021 St.Petersburg, Russia c Institut de Physique Nucléaire, CNRS-IN2P3, 91406 Orsay Cedex, France d Institut de Physique Nucléaire, CNRS-IN2P2, Universite Claude Bernard, Lyon I, 69622 Villeurbanne Cedex, France e Institut für Kernphysik der Technische Universität Darmstadt, Schloßgartenstraße 9, 64289 Darmstadt, Germany |
| Abstract: | Au nanoislet targets (∅ 2-60 nm) were bombarded by 200 keV polyatomic ions (40 keV/atom), which deposit their energy mainly in the nuclear stopping mode: ∑(dE/dx)n = 30 keV/nm and ∑(dE/dx)e = 2 keV/nm. The matter desorbed in the form of nanoclusters was registered by TEM. The total transfer of matter was determined by neutron-activation analysis. The total yield of the ejected gold reached high values of up to 2.6 × 104 atoms per Au5 ion. The major part (2 × 104 atoms per ion Au5) of the emission is in the form of nanoclusters. The results are compared with the data of similar experiments with 1 MeV Au5 (200 keV/atom) and other projectiles. The analysis of the experimental data and the comparison to molecular-dynamics simulation results of the desorption process show that the desorption of Au nanoislets is induced by their melting, build-up of pressure and thermal expansion. |
| Keywords: | 79 20 Rf 61 82 Rx 36 40 c |
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