Ion Backscattering from Solid Surfaces

Behrisch, R.; Eckstein, W.

doi:10.1007/978-1-4757-0067-1_10

Cited by 32 publications

(15 citation statements)

References 67 publications

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“…High values (above 80%) for the reflection coefficient R are derived in satisfactory agreement with the classical theory and other observed results [12]. The predictive goodness of the developed model and its capabilities to fit systematically the measured release curves has been shown.…”

Section: Discussion and Concluding Remarkssupporting

confidence: 67%

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Deuterium Recycling Rate Constants Derived from Plasma Implantation/Desorption Shots in a Martensitic Steel Surface

Sedano

Esteban²,

Perujo

2001

phys. stat. sol. (a)

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The recombination (K 2 ) and dissociation rate constants (K 1 ) are essential magnitudes for the tracking of tritium at the First Wall (FW) of Fusion Reactors (FR). This paper presents our plasma implantation/recycling test, the modelling of the experiment and the results obtained for K 2 and K 1 in the case of a deuterium (D þ 3 /D þ 2 ) plasma in the martensitic steel DIN 1.4914 (MANET). Once parasitic contributions were accounted, the D 2 release from the target was seen to be surface limited. The values obtained for K 1 and K 2 show low dispersion on impinging flux and ion energies. For K 1 a roughly constant value of 7 Â 10 --6 mol Pa --1 m --2 s --1 is derived. The obtained K 2 is written as: K 2 = 2.414 exp (--1571/RT) (m 4 mol --1 s --1 ), with R = 8.314 J mol --1 K --1 . Our activation energies agree with those existing in the literature derived from permeation experiments. High reflection coefficients are derived, which are in good agreement with the classical theory of ion scattering at low energy.

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Section: Discussion and Concluding Remarkssupporting

confidence: 67%

“…8. Obtained values for the reflection coefficient R and results from low-energy scattering theory [12] i.e.…”

Section: Resultsmentioning

confidence: 99%

Deuterium Recycling Rate Constants Derived from Plasma Implantation/Desorption Shots in a Martensitic Steel Surface

Sedano

Esteban²,

Perujo

2001

phys. stat. sol. (a)

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“…7) However, there are no experimental data on particle reflection coefficients in the low-energy region of less than 10 eV, and the theoretical model indicates that there is no significant energy dependence in the low energy region. 8) Further study is required to make clear the mechanism. Figure 8 shows a fracture surface of sample W1.…”

Section: Dependence Of Hole Structure On Incident Ion Energymentioning

confidence: 99%

Micron-Bubble Formation on Polycrystal Tungsten due to Low-Energy and High-Flux Helium Plasma Exposure

et al. 2005

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Surface modification of polycrystal tungsten due to low-energy and high-flux helium plasma exposure was investigated. Micron-sized holes and bubbles were formed on the surface at a surface temperature of 2200 K even when the incident ion energy of helium was 10 eV. Hole formation was significantly reduced on the surface when the incident ion energy of helium was around 5 eV and no surface modification was seen at less than 5 eV. Coalescence of micron-sized helium bubbles was observed in the cross section of a W sample.

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“…In turn, the results of ref. [21] have been reproduced by means of a version of the TRIM code [22], based on the BCA in amorphous materials, with the ad hoc assumption of a surface binding energy, Es--1 eV, for hydrogen on nickel [23].…”

Section: E~omentioning

confidence: 99%

Atomistic simulation of the interaction of slow protons with an iron surface

Rosato¹,

Ventura²

1993

Nouv Cim D

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Summary. --We have studied the dynamical behaviour of low-energy protons (1.0 eV ~< Ein < 50 eV) interacting with a Fe {100} surface at T = 300 K, by means of molecular-dynamics simulations. The inelastic energy losses have been taken into account by means of a friction term proportional to the projectile velocity and depending on the instantaneous local electronic density experienced by the projectile. For a given incident energy and irradiation geometry, we have estimated the particle and energy reflection coefficients and obtained a detailed evaluation of the different contributions (elastic and inelastic) to the energy loss of the reflected particles.PACS 61.80 -Radiation damage and other structural irradiation effects. -Introduction.The behaviour of hydrogen atoms and ions on metal surfaces is of utmost importance in several fundamental areas of material science. As an example, one can quote the problem of gas permeation of structural materials of the first wall of controlled-fusion devices, where particles of the cold plasma edges, escaping from magnetic confinement, impinge on the wall with a kinetic energy in the typical range 0.1-100 eV [1]. The presence of gas atoms in the bulk of these materials is the main cause of embrittlement and swelling phenomena.Few experimental data are available on the interaction of low-energy hydrogen ions with metal surfaces. Numerical simulations by means of widespread computer codes based on the binary collision approximation (like MARLOWE [2]) are not practicable, without ad hoc modifications, since the above-mentioned approximation breaks down in that energy range.Molecular dynamics (MD) seems to be, in this sense, a unique tool for investigating the microscopic surface structure and the dynamics of hydrogen on the surface. In this work we have performed a computer experiment, analogous to that of ref.[3], devoted to the interaction of helium ions with a nickel surface: it consists in studying the behaviour of a big number of protons thrown on an iron surface, one at a time, and estimating both the main thermodynamic and structural parameters of the 1263

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Ion Backscattering from Solid Surfaces

Cited by 32 publications

References 67 publications

Deuterium Recycling Rate Constants Derived from Plasma Implantation/Desorption Shots in a Martensitic Steel Surface

Deuterium Recycling Rate Constants Derived from Plasma Implantation/Desorption Shots in a Martensitic Steel Surface

Micron-Bubble Formation on Polycrystal Tungsten due to Low-Energy and High-Flux Helium Plasma Exposure

Atomistic simulation of the interaction of slow protons with an iron surface

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