Cluster formation in sputtering: A molecular dynamics study using the MD/MC-corrected effective medium potential

Wucher, A.; Garrison, Barbara J.

doi:10.1063/1.472451

Cited by 78 publications

(54 citation statements)

References 41 publications

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“…However, studies of heavy ion irradiation at lower energies ͑in the heat spike regime͒ have shown that heat spikes can lead to the emission of quite large atom clusters due to liquid flow, microexplosions, and corona formation. [604][605][606][607][608][609][610] The nanoparticle sputtering is likely explained by a similar effect arising from the swift heavy ion heat spikes.…”

Section: B Sputtering Of Nanoparticles By Swift Heavy Ionsmentioning

confidence: 99%

Ion and electron irradiation-induced effects in nanostructured materials

Krasheninnikov¹,

Nordlund²

2010

Journal of Applied Physics

936

591

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A common misconception is that the irradiation of solids with energetic electrons and ions has exclusively detrimental effects on the properties of target materials. In addition to the well-known cases of doping of bulk semiconductors and ion beam nitriding of steels, recent experiments show that irradiation can also have beneficial effects on nanostructured systems. Electron or ion beams may serve as tools to synthesize nanoclusters and nanowires, change their morphology in a controllable manner, and tailor their mechanical, electronic, and even magnetic properties. Harnessing irradiation as a tool for modifying material properties at the nanoscale requires having the full microscopic picture of defect production and annealing in nanotargets. In this article, we review recent progress in the understanding of effects of irradiation on various zero-dimensional and one-dimensional nanoscale systems, such as semiconductor and metal nanoclusters and nanowires, nanotubes, and fullerenes. We also consider the two-dimensional nanosystem graphene due to its similarity with carbon nanotubes. We dwell on both theoretical and experimental results and discuss at length not only the physics behind irradiation effects in nanostructures but also the technical applicability of irradiation for the engineering of nanosystems.

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Section: B Sputtering Of Nanoparticles By Swift Heavy Ionsmentioning

confidence: 99%

Ion and electron irradiation-induced effects in nanostructured materials

Krasheninnikov¹,

Nordlund²

2010

Journal of Applied Physics

936

591

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“…This is particularly important if one keeps in mind that sputtered clusters may contain a fair amount of internal energy (about 1 eV/atom for the case of sputtered silver clusters [15]), which may at least in part serve to signi®cantly lower eective ionization potentials.…”

Section: Neutral Clustersmentioning

confidence: 99%

Formation of large clusters during sputtering of silver

Staudt

Heinrich

Wucher

2000

Nuclear Instruments and Methods in Physics Research Section B:

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We have studied the formation of polyatomic clusters during sputtering of metal surfaces by keV ion bombardment. Both positively charged (secondary cluster ions) and neutral clusters have been detected in a time-of-¯ight mass spectrometer under otherwise identical experimental conditions, the sputtered neutrals being post-ionized by single photon absorption using a pulsed 157 nm VUV laser beam. Due to the high achievable laser intensity, the photoionization of all clusters could be saturated, thus enabling a quantitative determination of the respective partial sputtering yields. We ®nd that the relative yield distributions of sputtered clusters are strongly correlated with the total sputtering yield in a way that higher yields lead to higher abundances of large clusters. By using heavy projectile ions (Xe ) in connection with bombarding energies up to 15 keV, we have been able to detect sputtered neutral silver clusters containing up to about 60 atoms. For cluster sizes above 40 atoms, doubly charged species are shown to be produced in the photoionization process with non-negligible eciency. From a direct comparison of secondary neutral and ion yields, the ionization probability of sputtered clusters is determined as a function of the cluster size. It is demonstrated that even the largest silver clusters are still predominantly sputtered as neutrals. Ó

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“…The basics of these calculations have been described in great detail earlier, [12][13][14][15] and therefore only the parameters and modifications relevant to the present work will be mentioned here. In short, the motion of all target atoms is followed simultaneously by numerically solving the classical Newton equations of motion with electronic energy loss included as a friction mechanism using the Lindhard formalism.…”

Section: Computer Simulationsmentioning

confidence: 99%

Formation of excited Ag atoms in sputtering of silver

Šroubek

Wucher

et al. 2003

Phys. Rev. B

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A model is presented for the formation of excited Ag* (4d 9 5s 2 ) atoms during sputtering of Ag metal by energetic Ar ϩ ions. The essential part of the formation process is the slow diffusion of 4d holes in the collision cascade from the sites of violent Ag-Ag collisions to the emitted Ag atoms. A computer simulation of Ag cascades and of the 4d-hole transport allows us to quantify the model and to describe all characteristic features of the available experimental data, in particular the fact that the sputtered Ag* atoms exhibit a narrower kinetic energy distribution than those ejected in the electronic ground state.

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Cluster formation in sputtering: A molecular dynamics study using the MD/MC-corrected effective medium potential

Cited by 78 publications

References 41 publications

Ion and electron irradiation-induced effects in nanostructured materials

Ion and electron irradiation-induced effects in nanostructured materials

Formation of large clusters during sputtering of silver

Formation of excited Ag atoms in sputtering of silver

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