Electronic Stopping of Slow Protons in Oxides: Scaling Properties

Roth, D.; Bruckner, Barbara; Undeutsch, Gabriel; Paneta, V.; Mardare, Andrei Ionut; McGahan, Christina; Dosmailov, M.; Juaristi, J. I.; Alducin, M.; Pedarnig, J.D.; Haglund, Richard F.; Primetzhofer, Daniel; Bauer, Péter

doi:10.1103/physrevlett.119.163401

Cited by 43 publications

(40 citation statements)

References 55 publications

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“…[38], a Gd-oxide surface layer does not give rise to significant deviations from such a velocity proportionality of proton stopping even down to v = 0.15. This is in accord with other searches for such deviations in oxides [39], where only a faint influence of a gap might be visible at proton energies above 2 or 3 keV. Thus, it seems that either strong perturbations or also quasimolecular effects might open many electron-reaction channels that allow for a quasifree electronic motion during atomic interaction processes.…”

Section: Discussionsupporting

confidence: 89%

Stopping power of cluster ions in a free-electron gas from partial-wave analysis

et al. 2018

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A nonlinear model for the stopping power of cluster ions based on partial-wave analysis is developed through the generalization of the induced density approach (IDA) model for the interaction of homo-and heteronuclear molecular ions with a free-electron gas (IDAMol). We apply IDAMol to the energy loss of H 2 + dimers in SiO 2 and Al 2 O 3 , where we find that the results are consistent with established linear (dielectric) models at higher speeds, as expected for small perturbations (small values of the projectile charge or high velocities). Specifically at low projectile energies, however, it is important that IDAMol goes beyond perturbation theory. This feature appears to be central for a good description of negative and positive vicinage effects, a measure of the deviation from the independent-atom model. The focus of this work, however, is the investigation of enhanced nonlinear effects. Here we present experimental results for a heteronuclear cluster ion namely HeH + on Al 2 O 3 , in the energy range of few tens of keV/u using the medium energy ion scattering technique. The IDAMol results are corroborated by the experimental data and time-dependent density-functional calculations for this case. Strong nonlinearities are observed for the energy loss of the fragment H + due to the higher charge of its He companion.

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Section: Discussionsupporting

confidence: 89%

Stopping power of cluster ions in a free-electron gas from partial-wave analysis

et al. 2018

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“…hereafter)] has been relatively well understood within linear response [5][6][7] and non-linear response formalisms [8][9][10][11]. The linear and non-linear response approaches have been refined [12][13][14][15][16][17][18][19] but essentially remained limited in their practical applicability to simple metals and simple ions [20,21].…”

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confidence: 99%

Core Electrons in the Electronic Stopping of Heavy Ions

2018

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Electronic stopping power in the keV/Å range is accurately calculated from first principles for high atomic-number projectiles and the effect of core states is carefully assessed. The energy loss to electrons in self-irradiated nickel is studied using real-time time-dependent density functional theory. Different core states are explicitly included in the simulations to understand their involvement in the dissipation mechanism. The core electrons of the projectile are found to open additional dissipation channels as the projectile velocity increases. Almost all of the energy loss is accounted for, even for high projectile velocities, when core electrons as deep as 2s^{2}2p^{6} are explicitly treated. In addition to their expected excitation at high velocities, a flapping dynamical response of the projectile core electrons is observed at intermediate velocities. The empirical reference data are well reproduced in the projectile velocity range of 1.0-12.0 a.u. (1.5-210 MeV).

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“…Recent studies on the interaction of ions with solids in the very-low-energy range have produced new and relevant insights in various aspects of the interaction process, including nonlinear screening and band-structure effects [1][2][3][4][5][6]. In a recent work using light and heavy ions on a TiN target, Sortica et al [7] observed a striking discrepancy in the values of the electronic stopping cross section when compared with the standard predictions of the density functional theory (DFT) [8,9].…”

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confidence: 99%