A particularly fast TRIM version for ion backscattering and high energy ion implantation

Biersack, J.P.; Steinbauer, E.; Bauer, Péter

doi:10.1016/0168-583x(91)95564-t

Cited by 102 publications

(42 citation statements)

References 8 publications

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“…The most developed model of interaction is used in the widely known code TRIM [16], but its efficiency is not sufficient for simulation of backscattering. Biersack et al [24] found a possibility to increase the efficiency of this code up to an appropriate level without a significant loss of accuracy of the description. Figure 7(a) shows their results [25] for scattering of 100-keV protons from a 1000-Å-thick gold foil, together with the results of simulations done with the shower approach.…”

Section: Program Tests and Applicationsmentioning

confidence: 99%

Shower approach in the simulation of ion scattering from solids

et al. 2011

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An efficient approach for the simulation of ion scattering from solids is proposed. For every encountered atom, we take multiple samples of its thermal displacements among those which result in scattering with high probability to finally reach the detector. As a result, the detector is illuminated by intensive "showers," where each event of detection must be weighted according to the actual probability of the atom displacement. The computational cost of such simulation is orders of magnitude lower than in the direct approach, and a comprehensive analysis of multiple and plural scattering effects becomes possible. We use this method for two purposes. First, the accuracy of the approximate approaches, developed mainly for ion-beam structural analysis, is verified. Second, the possibility to reproduce a wide class of experimental conditions is used to analyze some basic features of ion-solid collisions: the role of double violent collisions in low-energy ion scattering; the origin of the "surface peak" in scattering from amorphous samples; the low-energy tail in the energy spectra of scattered medium-energy ions due to plural scattering; and the degradation of blocking patterns in two-dimensional angular distributions with increasing depth of scattering. As an example of simulation for ions of MeV energies, we verify the time reversibility for channeling and blocking of 1-MeV protons in a W crystal. The possibilities of analysis that our approach offers may be very useful for various applications, in particular, for structural analysis with atomic resolution.

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Section: Program Tests and Applicationsmentioning

confidence: 99%

Shower approach in the simulation of ion scattering from solids

et al. 2011

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“…22 A precise description of the simulations is given by de Ridder et al 23 The obtained barium depth distribution for the LEIS spectra presented in Fig. 5 is shown in Fig.…”

Section: Comparison Between High and Low Metal Deposition Ratesmentioning

confidence: 99%

Interface formation between metal and poly-dialkoxy-p-phenylene vinylene

et al. 2004

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In this work we address the dynamics and stability of calcium/PPV and barium/PPV interfaces during and after deposition of the metal. Diffusion of calcium and barium into OC 1 C 10 PPV is studied with low energy ion scattering (LEIS) and x-ray photoelectron spectroscopy (XPS). During metal deposition the diffusivity is found to be orders of magnitude higher than after deposition and the diffusion coefficient was found to be dependent on the metal concentration in the PPV. Furthermore, the amount of metal inside the polymer films was found to depend on the deposition rate. These observations were explained in a two-stage diffusion model. In the first stage atoms land on the surface and diffuse fast into the polymer and in the second stage metal ionizes and is trapped and diffusion is strongly decreased. The diffusion coefficient of barium into PPV at T = 298 K is found to be almost an order of magnitude lower than the diffusion coefficient of calcium into PPV [͑0.35± 0.05͒ ϫ 10 −23 m 2 / s and ͑2.7± 0.4͒ ϫ 10 −23 m 2 / s, respectively]. Furthermore, the activation energy of the diffusion process of barium into PPV ͑0.75± 0.07eV͒ is significantly higher than the activation energy of the diffusion process of calcium into PPV ͑0.62± 0.05 eV͒. The difference in diffusion coefficient and activation energy between calcium and barium are discussed in terms of an Arrhenius law of diffusion. Finally, polymer LED performance was studied as a function of the amount of metal diffused into the polymer layer. It was observed that the light output and the efficiency decreased as the amount of metal in the PPV increased. This indicates that the metal ions form charge carrier traps and exciton quenching sites in the PPV.

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“…Because of the influence of multiple scattering at low energies, the ratios of the experimental 6 spectra in an energy interval close to the kinematic onset [25] were compared to the results from corresponding Monte Carlo simulations (TRBS, [26]). In the simulations, the ZBL potential [27] was used, and Au was set to match the experimental value (SCS data from [14]), leaving X as the only parameter, which was optimized until convergence was reached;…”

Section: At High Ion Velocities V >> Vf (Vf Denotes the Fermi Velocitmentioning

confidence: 99%

Electronic Stopping of Slow Protons in Transition and Rare Earth Metals: Breakdown of the Free Electron Gas Concept

et al. 2017

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The electronic stopping cross sections (SCS) of Ta and Gd for slow protons have been investigated experimentally. The data are compared to the results for Pt and Au, to learn how electronic stopping in transition and rare earth metals correlates with features of the electronic band structures. The extraordinarily high SCS observed for protons in Ta and Gd cannot be understood in terms of a free electron gas model, but are related to the high densities of both occupied and unoccupied electronic states in these metals.

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A particularly fast TRIM version for ion backscattering and high energy ion implantation

Cited by 102 publications

References 8 publications

Shower approach in the simulation of ion scattering from solids

Shower approach in the simulation of ion scattering from solids

Interface formation between metal and poly-dialkoxy-p-phenylene vinylene

Electronic Stopping of Slow Protons in Transition and Rare Earth Metals: Breakdown of the Free Electron Gas Concept

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