Velocity-dependent screening in metals

Lifschitz, Agustín; Arista, N. R.

doi:10.1103/physreva.57.200

Cited by 79 publications

(72 citation statements)

References 18 publications

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“…Many different physical processes contribute to the electronic stopping: ionization of the target atoms, excitation of electrons into the conduction band, collective electronic excitations such as plasmons, etc. [89][90][91][92][93][94][95][96][97][98][99][100][101][102] Electronic stopping dominates at high ion energies ͑see Fig. 2͒.…”

Section: A Production Of Defects In Bulk Targetsmentioning

confidence: 99%

Ion and electron irradiation-induced effects in nanostructured materials

Krasheninnikov¹,

Nordlund²

2010

Journal of Applied Physics

936

591

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A common misconception is that the irradiation of solids with energetic electrons and ions has exclusively detrimental effects on the properties of target materials. In addition to the well-known cases of doping of bulk semiconductors and ion beam nitriding of steels, recent experiments show that irradiation can also have beneficial effects on nanostructured systems. Electron or ion beams may serve as tools to synthesize nanoclusters and nanowires, change their morphology in a controllable manner, and tailor their mechanical, electronic, and even magnetic properties. Harnessing irradiation as a tool for modifying material properties at the nanoscale requires having the full microscopic picture of defect production and annealing in nanotargets. In this article, we review recent progress in the understanding of effects of irradiation on various zero-dimensional and one-dimensional nanoscale systems, such as semiconductor and metal nanoclusters and nanowires, nanotubes, and fullerenes. We also consider the two-dimensional nanosystem graphene due to its similarity with carbon nanotubes. We dwell on both theoretical and experimental results and discuss at length not only the physics behind irradiation effects in nanostructures but also the technical applicability of irradiation for the engineering of nanosystems.

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Section: A Production Of Defects In Bulk Targetsmentioning

confidence: 99%

Ion and electron irradiation-induced effects in nanostructured materials

Krasheninnikov¹,

Nordlund²

2010

Journal of Applied Physics

936

591

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“…It is important to stress that other choices of screening functions from Ref. 13 like, for instance, the single-zeta type, could enlarge the mean energy loss straggling due to the Coulomb explosion and the Coulomb heating effect value as well.…”

Section: ͑8͒mentioning

confidence: 99%

“…The angle between the molecular axis and the motion direction is chosen randomly, as well as the projectile initial position along the transverse channel plane. The interaction between the fragments of the H 2 + molecule was modeled using three different potentials: ͑i͒ a pure Coulomb potential; ͑ii͒ a Yukawa potential with a dynamic screening function according to the Arista and Lifschitz approach 13 ͑screening length of about 4 a . u. for the present case͒; and ͑iii͒ a wake-type potential, whose target dielectric properties were described by a Mermim dielectric function ͑using an electron radius of r s =2 a.u.͒.…”

Section: ͑2͒mentioning

confidence: 99%

Interplay between the Coulomb explosion and vicinage effects studied usingH2+molecules under channeling conditions

et al. 2006

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The aim of this work is to investigate how the mean energy loss and straggling due to H 2 + molecules interacting with silicon are affected by the Coulomb explosion and vicinage effects. To that end, a SIMOX-type sample made up of 18 O and with an appropriate 18 O marker grown over the surface of crystalline Si was employed, allowing to carry out the measurements through the 18 O͑p , ␣͒ 15 N resonant reaction at 151.2 keV under channeling and random directions. The results show that the mean energy loss associated with the Coulomb explosion and vicinage effects are similar and amount each to about 2% of the total mean energy loss. The comparison of the energy straggling obtained for molecular beams at random and the well-aligned ͗100͘ direction shows a larger value for the aligned case, which is interpreted as a result of the Coulomb explosion along the channel direction. The experimental results are also discussed in terms of Monte Carlo simulations.

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“…[16]): a) the Coulomb potential, that describes the potential induced by a moving point charge in vacuum; b) the Bohr potential, that describes a potential produced by a external point charge immersed in a homogenous electron gas. The screening parameter (α i ) can be obtained either from the Debye screening length [17] or from the generalization of the Friedel sum rule for finite velocities derived by Lifschitz and Arista [18]; c) the single-zeta potential, that describes the potential due a projectile carrying one or two bound electrons (n i = 1, 2) in hydrogen-like 1s orbitals.…”

Section: Modelmentioning

confidence: 99%

Impact-parameter dependence of the electronic energy loss of fast cluster projectiles

Fadanelli¹,

Grande²,

Schiwietz³

2005

Nuclear Instruments and Methods in Physics Research Section B:

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Electronic energy loss of molecular clusters as a function of impact-parameter is less understood than atomic energy loss. Vicinage effects due to mutual interference between cluster fragments play a key role in the determination of the cluster electronic energy loss. In this work, we describe a molecular extension of the PCA (perturbative convolution approximation) energy-loss model, namely MPCA (molecular PCA), which yields remarkable agreement with first-order Born (SCA) results. The physical inputs of the model are the oscillators strengths of the target atoms and the projectile electron density. A very good agreement is obtained with time consuming full first-order calculations for bare incident molecular clusters for several angles between cluster axis and velocity direction.

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Velocity-dependent screening in metals

Cited by 79 publications

References 18 publications

Ion and electron irradiation-induced effects in nanostructured materials

Ion and electron irradiation-induced effects in nanostructured materials

Interplay between the Coulomb explosion and vicinage effects studied usingH2+molecules under channeling conditions

Impact-parameter dependence of the electronic energy loss of fast cluster projectiles

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