Low- and intermediate-energy stopping power of protons and antiprotons in solid targets

Montanari, C. C.; Miraglia, J. E.

doi:10.1103/physreva.96.012707

Cited by 32 publications

(16 citation statements)

References 75 publications

(131 reference statements)

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“…At sufficiently low energies (v < v F ), the stopping process can be finally described as the interaction with a free-electron gas (FEG) [12,13]. At these intermediate and low ion energies, a series of recent experimental and theoretical studies aim on improving our understanding of the ion-solid interaction [14][15][16], as well as on exploring complex nonequilibrium solid-state physics [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Experimental electronic stopping cross section of transition metals for light ions: Systematics around the stopping maximum

2020

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Electronic stopping cross sections of different transition metals (Nb, Pd, Ta, and Pt) for light ions have been experimentally determined in a wide energy range. We performed relative measurements using different backscattering geometries for protons (from 50 to 5000 keV) and helium (from 80 to 10 000 keV). Data are compared to values from the literature, as well as to the widely used semiempirical (SRIM) and modeling (DPASS) approaches. The magnitude and energy dependence of the deduced stopping power at energies around the Bragg peak, as well as the different trends observed within individual periods, are analyzed with respect to target atomic number and electronic structure. We also compare the observed magnitude of electronic stopping to several different theoretical approaches.

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Section: Introductionmentioning

confidence: 99%

Experimental electronic stopping cross section of transition metals for light ions: Systematics around the stopping maximum

2020

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“…with g(|r − r |) being the radial pair distribution function of the electrons evaluated in thermodynamic equilibrium. In particular, STLS-based methods were extensively applied to study the energy loss in dense plasmas and WDM [23,29,[63][64][65][66].…”

Section: Stls Model For the Lfcmentioning

confidence: 99%

“…( 7)] is linearly proportional to the projectile velocity. This is the motivation to introduce the so-called friction function Q(v), which is defined by the relation [63]:…”

Section: E Energy Loss Propertiesmentioning

confidence: 99%

Energy loss and friction characteristics of electrons at warm dense matter and non-ideal dense plasma conditions

Moldabekov,

Dornheim,

Bonitz

et al. 2020

Preprint

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We investigate the energy loss characteristics of warm dense matter (WDM) and dense plasmas concentrating on the influence of electronic correlations. The basis for our analysis is a recently developed ab initio Quantum Monte-Carlo (QMC) based machine-learning representation of the static local field correction (LFC) [Dornheim et al., J. Chem. Phys. 151, 194104 (2019)], which provides an accurate description of the dynamical density response function of the electron gas at the considered parameters. We focus on the polarization-induced stopping power due to free electrons, the friction function, and the straggling rate. In addition, we compute the friction coefficient which constitutes a key quantity for the adequate Langevin dynamics simulation of ions. Considering typical experimental WDM parameters with partially degenerate electrons, we find that the friction coefficient is of the order of γ/ωpi = 0.01, where ωpi is the ionic plasma frequency. This analysis is performed by comparing QMC based data to results from the random phase approximation (RPA), the Mermin dielectric function, and the Singwi-Tosi-Land-Sjölander (STLS) approximation. It is revealed that the widely used relaxation time approximation (Mermin dielectric function) has severe limitations regarding the description of the energy loss properties of correlated partially degenerate electrons. Moreover, by comparing QMC based data with the results obtained using STLS, we find that energy loss properties are not sensitive to the inaccuracy of the static LFC at large wave numbers k/kF > 2 (with kF being the usual Fermi wave number), but that a correct description of the static LFC at k/kF 1.5 is important.

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“…These processes are important at high projectileenergies as well as at low velocities in case of conducting materials and can be described by different models and approaches [4,5]. Particularly the energy loss to conduction electrons in a solid has been successfully modeled by a degenerate electron gas system [4,5,[8][9][10][11][12][13][14][15][16][17] although the breakdown of the free electron gas (FEG) concept has been recently reported [18].…”

Section: Introductionmentioning

confidence: 99%

Ground- and excited-state scattering potentials for the stopping of protons in an electron gas

Matias

Fadanelli

Grande

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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The self-consistent electron-ion potential V(r) is calculated for H + ions in an electron gas system as a function of the projectile energy to model the electronic stopping power for conduction-band electrons. The results show different self-consistent potentials at low projectile-energies, related to different degrees of excitation of the electron cloud surrounding the intruder ion. This behavior can explain the abrupt change of velocity dependent screening-length of the potential found by the use of the extended Friedel sum rule and the possible breakdown of the standard free electron gas model for the electronic stopping at low projectile energies. A dynamical interpolation of V(r) is proposed and used to calculate the stopping power for H + interacting with the valence electrons of Al. The results are in good agreement with the TDDFT benchmark calculations as well as with experimental data.

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Low- and intermediate-energy stopping power of protons and antiprotons in solid targets

Cited by 32 publications

References 75 publications

Experimental electronic stopping cross section of transition metals for light ions: Systematics around the stopping maximum

Experimental electronic stopping cross section of transition metals for light ions: Systematics around the stopping maximum

Energy loss and friction characteristics of electrons at warm dense matter and non-ideal dense plasma conditions

Ground- and excited-state scattering potentials for the stopping of protons in an electron gas

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