Apparent Velocity Threshold in the Electronic Stopping of Slow Hydrogen Ions in LiF

Draxler, M.; Chenakin, S. P.; Markin, S.N.; Bauer, Péter

doi:10.1103/physrevlett.95.113201

Cited by 53 publications

(52 citation statements)

References 27 publications

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“…For protons in LiF a deviation from the velocity proportionality of the stopping power was found recently by Draxler et al 1 for proton kinetic energies below 3.8 keV. Stopping-power experiments using antiproton projectiles have been reported for energies down to 4 keV where the measured data are still consistent with metallic behavior of LiF.…”

Section: Introductionsupporting

confidence: 71%

“…[1][2][3][4][5] Apart from fundamental aspects, the detailed knowledge of the energy deposition in the target along the projectile path is important for technical and medical applications such as ionbeam analysis or radiotherapy. Of particular interest is the comparative analysis of charge conjugated projectiles of equal mass, protons ͑p͒, and antiprotons ͑p͒.…”

Section: Introductionmentioning

confidence: 99%

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Vanishing gap in LiF for electronic excitations by slow antiprotons

Solleder

Wirtz²,

Burgdörfer

2009

Phys. Rev. B

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We study the influence of antiprotons and protons traveling through LiF on the band structure of the insulator using the embedded-cluster method. The crystal is represented by F m − Li n + clusters with up to 19 fluorine ions embedded in a lattice of point charges representing the remainder of the crystal. The minimum excitation energy of LiF perturbed by the ͑anti͒proton impurity is calculated employing the multiconfiguration self-consistent field method. The repulsive potential of the antiproton causes a dramatic local perturbation of the LiF band structure. We find a strong suppression of the excitation energy by more than an order of magnitude compared to that of the unperturbed crystal. The present results provide a simple explanation of recent stopping-power experiments for antiprotons in LiF which, surprisingly, found a "metal-like" behavior of the wide-band-gap insulator LiF. Our results also agree with recent experimental data indicating a deviation from metallic behavior of the stopping power of proton projectiles.

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Section: Introductionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Vanishing gap in LiF for electronic excitations by slow antiprotons

Solleder

Wirtz²,

Burgdörfer

2009

Phys. Rev. B

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“…Pruneda et al [138] examined the case of protons and anti-protons penetrating the insulator lithium fluoride. Experimental data for the electronic stopping power of LiF for various penetrating particles suggests the existence of a threshold effect [139,140,141]. Below a certain velocity (0.1 v 0 for protons in LiF) the electronic stopping power drops nearly to zero, violating the standard dE/dx ∝ v behaviour.…”

Section: Time-dependent Density Functional Theorymentioning

confidence: 99%

The treatment of electronic excitations in atomistic models of radiation damage in metals

Race¹,

Mason²,

Finnis³

et al. 2010

Rep. Prog. Phys.

135

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Abstract. Atomistic simulations are a primary means of understanding the damage done to metallic materials by high energy particulate radiation. In many situations the electrons in a target material are known to exert a strong influence on the rate and type of damage. The dynamic exchange of energy between electrons and ions can act to damp the ionic motion, to inhibit the production of defects or to quench in damage, depending on the situation. Finding ways to incorporate these electronic effects into atomistic simulations of radiation damage is a topic of current major interest, driven by materials science challenges in diverse areas such as energy production and device manufacture.In this review, we discuss the range of approaches that have been used to tackle these challenges. We compare augmented classical models of various kinds and consider recent work applying semi-classical techniques to allow the explicit incorporation of quantum mechanical electrons within atomistic simulations of radiation damage. We also outline the body of theoretical work on stopping power and electron-phonon coupling used to inform efforts to incorporate electronic effects in atomistic simulations and to evaluate their performance.

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“…Here we employ a velocity dependent damping factor calculated from the SRIM electronic stopping power. The occurrence of a low-energy threshold for electronic stopping has been observed in semiconductors 16,17 , and is explained by the band gap inhibiting excitation of electrons below a certain energy. Similar effects have also been reported in metals 18 .…”

Section: Recent Experimentsmentioning

confidence: 99%

High-energy collision cascades in tungsten: Dislocation loops structure and clustering scaling laws

Sand¹,

Dudarev²,

Nordlund³

2013

EPL

197

183

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Recent experiments on in-situ high-energy self-ion irradiation of tungsten (W) show the occurrence of unusual cascade damage effects resulting from single ion impacts, shedding light on the nature of radiation damage expected in the tungsten components of a fusion reactor. In this paper, we investigate the dynamics of defect production in 150 keV collision cascades in W at atomic resolution, using molecular dynamics simulations and comparing predictions with experimental observations. We show that cascades in W exhibit no subcascade break-up even at high energies, producing a massive, unbroken molten area, which facilitates the formation of large defect clusters. Simulations show evidence of the formation of both 1 /2 111 and 100 interstitial-type dislocation loops, as well as the occurrence of cascade collapse resulting in 100 vacancy-type dislocation loops, in excellent agreement with experimental observations. The fractal nature of the cascades gives rise to a scaleless power law type size distribution of defect clusters.

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Apparent Velocity Threshold in the Electronic Stopping of Slow Hydrogen Ions in LiF

Cited by 53 publications

References 27 publications

Vanishing gap in LiF for electronic excitations by slow antiprotons

Vanishing gap in LiF for electronic excitations by slow antiprotons

The treatment of electronic excitations in atomistic models of radiation damage in metals

High-energy collision cascades in tungsten: Dislocation loops structure and clustering scaling laws

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