Note on measuring electronic stopping of slow ions

Sigmund, Peter; Schinner, Andreas

doi:10.1016/j.nimb.2017.08.011

Cited by 35 publications

(32 citation statements)

References 69 publications

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“…For the most frequently used transmission technique pertinent features have been discussed in [7], based on earlier work by Fastrup et al [18] and ref. [19]. The essential point is that the conctribution from nuclear stopping is minimized by analyzing transmitted ions only within a narrow cone around the incident-beam direction.…”

Section: Discussionmentioning

confidence: 99%

“…The analysis developed in refs. [19] and [7] is an extension of a scheme proposed by Fastrup et al [18]. It is assumed that particles emerging at an angle α less than the multiple-scattering angle α 1 experience a nuclear energy loss given by…”

Section: Nuclear Stoppingmentioning

confidence: 99%

“…Below 0.001 MeV/u, angular deflection causes deviations from the expected linear velocity dependence of the stopping cross section [12]. Computations are performed with the ASCS code [19], which determines reduced stopping cross sections for a given projectile-target combination as a function of beam energy E, detector opening angle φ and a dimensionless target thickness…”

Section: Electronic Stoppingmentioning

confidence: 99%

“…Despite the strength of the Lindhard-Scharff formula indicated by Figure 2 we do not apply it here because there is no impact-parameter dependence assigned to it. Computations based on the Firsov formula have been very useful in the development of our scheme [19], but in the present work we mainly work with PASS, which covers a wider range of atomic numbers and beam energies.…”

Section: Cautional Remarksmentioning

confidence: 99%

“…All reduced stopping cross sections have been computed with parameters φ = 0.02 rad and ξ = 10. However, in aluminium, only the stopping cross sections for the K and L shell depend on the scattering angle, whereas the M electrons are treated as a free electron gas [19]. Since, at low energies, stopping is mainly due to outer-shell electrons, the difference between reduced and full stopping cross section is seen to be very small for Si-Al, C-Al and Al-Al.…”

Section: Carbon Aluminium and Siliconmentioning

confidence: 99%

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Reciprocity analysis of electronic stopping of slow ions

Sigmund

Kuzmin

Schinner

2019

Nuclear Instruments and Methods in Physics Research Section B:

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Reciprocity denotes the (approximate) equality of the electronic stopping cross section of element A in element B with the one of element B in element A. Reciprocity is expected in the energy range below ∼ 0.1 MeV/u. For ions heavier than protons, most measurements are performed by the transmission technique. In order to minimize nuclear energy loss, only a narrow beam of penetrating ions is allowed to enter the detector. This implies that also the electronic energy loss is underestimated. We have estimated the magnitude of the necessary correction on the basis of the PASS code and its influence on the expected reciprocity and find that reciprocity is not necessarily violated, even if the reported cross sections differ significantly. However, we also find differences between reported stopping cross sections and computed reduced stopping cross sections that we cannot reconcile on the basis of the PASS code. These differences are found to reflect the well-known Z 1 structure, which is not inherent in the present version of PASS.

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Section: Discussionmentioning

confidence: 99%

Section: Nuclear Stoppingmentioning

confidence: 99%

Section: Electronic Stoppingmentioning

confidence: 99%

Section: Cautional Remarksmentioning

confidence: 99%

Section: Carbon Aluminium and Siliconmentioning

confidence: 99%

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Reciprocity analysis of electronic stopping of slow ions

Sigmund

Kuzmin

Schinner

2019

Nuclear Instruments and Methods in Physics Research Section B:

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Thin-film assembly via encapsulation of nano-aluminum oxide-linked-pb(II)-2,4-dinitroaniline complex into a polymeric matrix as efficient radiation shielding materials

Hussein,

Madbouly,

Allam

et al. 2023

Appl. Phys. A

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Radiation safety and protection is a subject of major concern for all communities because of the biological damage caused by different radiation sources. Therefore, the purpose of this study is aimed to synthesize two different thin films from a newly synthesized N-Al2O3@Pb(II)-2,4-DiNA nanocomposite which was prepared by the direct chemical coupling of nano-aluminum oxide (N-Al2O3) with Pb(II)-2,4-dinitroaniline complex. The synthesized materials were characterized by FT-IR, thermogravimetric analysis (TGA), scanning electron microscope SEM, and elemental composition by energy-dispersive X-ray (EDX). The two thin films were assembled by the encapsulation of N-Al2O3@Pb(II)-2,4-DiNAnanocompositeinto hydrolyzed polyurethane and hydrolyzed polyvinyl chloride. Electron spin resonance (ESR) measurements have been used to investigate the newly prepared nanocomposite and thin films before and after gamma irradiation. Gamma spectroscopy, Phy-X software, and SRIM (stopping and range of ions in matter) Monte Carlo simulation code are aimed to apply and investigate radiation shielding efficiency of films for gamma/x-ray, protons, alpha, and thermal neutrons. The gamma shielding characteristics, mass stopping power (MSP), and range for both proton (H-ions) and alpha (He-ions) were also calculated. In addition, the SRIM code’s subroutine TRIM was used to predict the damage production and atomic displacements per atom (dpa) caused by the interaction of high-energy H-ions (proton) and He-ions (alpha) with the studied samples. The data obtained the good radiation shielding effect of the prepared thin films and their possible use as radiation shielding materials for X-rays and low gamma energy.

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