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Figueroa, E.; Cantero, E. D.; Eckardt, J. C.; Lantschner, G. H.; Martiarena, M. L.; Arista, N. R.

doi:10.1103/physreva.78.032901

Cited by 9 publications

(5 citation statements)

References 37 publications

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“…The corresponding ratio for transmitted fragments and isolated protons at 4 and 5 keV/u incident energies appear in Figure 5b. The differences observed in the case of the low energy-loss peaks can be ascribed to the so-called "vicinage effect", and they are in qualitative good agreement with previous theoretical predictions [17] and experimental findings for dissociated molecular fragments moving under channelling conditions in the low-energy range [18][19][20]. The differences in the width of the energy loss corresponding to the high energy-loss peaks are not attributable to "vicinage effect", since this result is mainly due to the joint contribution of the MWCNT and substrate to the increase of the thickness traversed by the projectiles, which results in broader energy distributions.…”

Section: Discussionsupporting

confidence: 89%

Energy loss of H+ and H2+ beams in carbon nanotubes: a joint experimental and simulation study

et al. 2019

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Carbon nanotube properties can be modified by ion irradiation; therefore it is important to know the manner in which ions deposit energy (how much and where) in the nanotubes. In this work, we have studied, experimentally and with a simulation code, the irradiation of multi-walled carbon nanotubes (MWCNT), supported on a holey amorphous carbon (a-C) substrate, with low energy (2−10 keV/u) H + and H2 + molecular beams, impinging perpendicularly to the MWCNT axis. The energy distribution of protons traversing the nanotubes (either from the H + beam or dissociated from the H2 + beam) was measured by the transmission technique in the forward direction. Two well-differentiated peaks appear in the experimental energy-loss distribution of the fragments dissociated from the molecular H2 + beam, in correspondence to the ones detected with the proton beam. One is the low-energy loss peak (LELP), which has a symmetric width; the other is the high-energy loss peak (HELP), which shows an asymmetric broadening towards larger energy loss than the corresponding proton energy distribution. A semi-classical simulation, accounting for the main interaction processes (both elastic and inelastic), of the proton trajectories through the nanotube and the supporting substrate has been done, in order to elucidate the origin of these structures in the energy spectra. Tregarding the H + energy spectrum, the LELP corresponds to projectiles that travel in quasi-channelling motion through the most outer walls of the nanotubes and then pass thorugh the substrate holes, whereas the HELP results mostly from projectiles traversing only the a-C substrate, with the asymmetry broadening being due to a minor contribution of those protons that cross the a-C substrate after exiting the nanotube. The broadening of the peaks corresponding to dissociated fragments, with respect to that of the isolated protons, is the result of vicinage effects between the fragments, when travelling in quasi-channelling conditions through the outer layers of the nanotube, and Coulomb explosion just after exiting the target. The excellent agreement between the measured and the simulated energy spectra of the H + beam validates our simulation code in order to predict the energy deposited by ion beams in carbon nanotubes.

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Section: Discussionsupporting

confidence: 89%

Energy loss of H+ and H2+ beams in carbon nanotubes: a joint experimental and simulation study

et al. 2019

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“…(b) Electronic stopping: since in a solid the electron density is nonuniform, impact parameter dependence in electronic stopping is observed for certain experimental conditions, e.g., in channelling geometry [24][25][26]. When, however, trajectories comprise a multitude of scattering events, e.g., in polycrys-talline targets, one may assume that electronic energy loss along the trajectory is similar in TR and BS.…”

Section: Transmission Versus Backscatteringmentioning

confidence: 99%

Energy loss of low-energy ions in transmission and backscattering experiments

et al. 2013

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The determination of the electronic stopping power for low-energy ions is an experimentally demanding task. In this paper we elaborate on the different effects of nuclear stopping and multiple scattering on the energy spectra for different experimental geometries, i.e., transmission through thin foils and backscattering from thin films. By calculating distributions of path lengths and scattering angles we demonstrate how electronic stopping, nuclear stopping, and multiple scattering add up to the total energy loss. We show that at low energies it is important to properly disentangle these effects to extract electronic stopping from the measured energy loss spectra.

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“…Since the early 2000s several studies of the angular distributions and of the angular dependence of the energy loss of low-energy light ions have been published [7][8][9][10]. For polycrystalline samples, a simple model to evaluate the angular dependence of the energy loss of low-energy protons was proposed and successfully compared with experimental data of 9-keV protons transmitted through thin aluminium and gold films [7].…”

Section: Introductionmentioning

confidence: 99%

Multiple-scattering distributions and angular dependence of the energy loss of slow protons in copper and silver

et al. 2010

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Measurements of angular distributions and of the angular dependence of the energy loss of 4-, 6-, and 9-keV protons transmitted through thin Cu and Ag polycrystalline foils are presented. By means of standard multiple-scattering model calculations it is found that a V (r) ∝ r −2.8 potential leads to significantly better fits of the angular distributions than the standard Thomas Fermi, Lenz-Jensen, or Ziegler-Biersack-Littmark potentials. A theoretical model for the angular dependence of the energy loss based on considering geometric effects on a frictional inelastic energy loss plus an angular-dependent elastic contribution and the effects of foil roughness reproduces the experimental data. This agrees with previous results in Au and Al, therefore extending the applicability of the model to other metallic elements.

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Energy loss versus exit angle forH+andHe+ions channeled in Au ⟨100⟩ at very low energies, and observation of a molecular effect for incident
E. Figueroa
¹
,
E. D. Cantero
²
,
J. C. Eckardt
³

et al.

Cited by 9 publications

References 37 publications

Energy loss of H+ and H2+ beams in carbon nanotubes: a joint experimental and simulation study

Energy loss of H+ and H2+ beams in carbon nanotubes: a joint experimental and simulation study

Energy loss of low-energy ions in transmission and backscattering experiments

Multiple-scattering distributions and angular dependence of the energy loss of slow protons in copper and silver

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Energy loss versus exit angle forH+andHe+ions channeled in Au ⟨100⟩ at very low energies, and observation of a molecular effect for incidentE. Figueroa1, E. D. Cantero2, J. C. Eckardt3 et al.

Cited by 9 publications

References 37 publications

Energy loss of H+ and H2+ beams in carbon nanotubes: a joint experimental and simulation study

Energy loss of H+ and H2+ beams in carbon nanotubes: a joint experimental and simulation study

Energy loss of low-energy ions in transmission and backscattering experiments

Multiple-scattering distributions and angular dependence of the energy loss of slow protons in copper and silver

Contact Info

Product

Resources

About

Energy loss versus exit angle forH+andHe+ions channeled in Au ⟨100⟩ at very low energies, and observation of a molecular effect for incident
E. Figueroa
¹
,
E. D. Cantero
²
,
J. C. Eckardt
³

et al.