Special Issue Editors

Dr. Alex M. Imai

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Guest Editor

Department of Nuclear Engineering, Kyoto University, Kyoto 615-8540, Japan
Interests: charge-state distribution measurements/calculations after ion-atom/solid collisions; atomic-collision data production, compilation, and evaluation for nuclear fusion; electron spectroscopy in atomic collisions; environmental radioactivity in Fukushima

Dr. Viacheslav P. Shevelko

E-Mail Website
Guest Editor

Optical Department,P.N.Lebedev Physical Institute, Moscow 119991, Russia
Interests: ion-atom collisions; loss and capture cross sections; dynamics of charge-state fractions of ion beams in matter; relativistic collisions

Dr. Emily Lamour

E-Mail Website
Guest Editor

Faculty of Science and Engineering, Sorbonne University, 75005 Paris, France
Interests: ion energy transfer in solids and plasmas; electronic atomic processes as ionization, excitation and capture in ion-atom and ion-ion collisions; ETACHA code

Special Issue Information

Dear Colleagues,

Since atomic collision phenomena are strongly affected by the charge-states of the projectile ions, both equilibrium and pre-equilibrium charge-states of penetrating ions in solid, dense-gas media and plasmas are essential to pure and applied atomic collision studies. As for the equilibrium charge-states, there has been a number of papers, compilations, and databases published in the literature, but there still a few for pre-equilibrium charge-state evolutions especially for heavy ion collisions in low-energy range although they are highly demanded in material science, biological physics, accelerator technology and so on. After recent advances in experiments (target preparations etc.), theories (cross section calculations etc.), as well as simulations (including more advanced models), this Special Issue of Atoms will highlight many kinds of contributions related to charge-state evolutions in ion-atom/solid and plasma collisions, ranging from basic data production, simulation codes and cross sections, to application studies which needs a knowledge of charge-state evolutions and to scope also their future needs.

Mr. Alex M. Imai
Dr. Viacheslav P. Shevelko
Dr. Emily Lamour
Guest Editors

Manuscript Submission Information

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Keywords

atomic collision
ion-atom, ion-molecule, and ion-solid collisions
equilibrium and non-equilibrium charge-states
excitation, de-excitation, ionization, and charge-transfer
multiple-electron processes

Published Papers (2 papers)

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Research

Jump to: Review

11 pages, 2053 KiB

Open AccessEditor’s ChoiceArticle

Impact Features Induced by Single Fast Ions of Different Charge-State on Muscovite Mica

by Igor Alencar, Marcos R. Silva, Rafael Leal, Pedro L. Grande and Ricardo M. Papaléo

Atoms 2021, 9(1), 17; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms9010017 - 25 Feb 2021

Cited by 6 | Viewed by 2944

Abstract

The influence of the charge state q on surface modifications induced by the impact of individual fast, heavy ions on muscovite mica was investigated. Beams of 593 MeV

^{197}

^{q +}

with well-defined initial charge states over a relatively broad range of [...] Read more.

The influence of the charge state q on surface modifications induced by the impact of individual fast, heavy ions on muscovite mica was investigated. Beams of 593 MeV

^{197}

^{q +}

with well-defined initial charge states over a relatively broad range of values (30 to 51) and at different irradiation geometries were used. At normal incidence, the impact features are rounded protrusions (hillocks) with ≳20 nm in diameter. At grazing angles, besides the hillocks, craters and elongated tails (up to 350 nm-long) extending along the direction of ion penetration are produced. It is shown that the impact features at normal incidence depend strongly on the initial charge state of the projectiles. This dependence is very weak at grazing angles as the ion reaches the equilibrium charge state closer to the surface. At normal ion incidence, the hillock volume scales with

q^{3.3 \pm 0.6}

. This dependence stems largely from the increase in the hillock height, as a weak dependence of the diameter was observed. Full article

(This article belongs to the Special Issue Charge-State Evolution in Ion-Atom/Solid Collisions)

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Figure 1

Review

Jump to: Research

23 pages, 4023 KiB

Open AccessReview

Charge State Effect of High Energy Ions on Material Modification in the Electronic Stopping Region

by Noriaki Matsunami, Masao Sataka, Satoru Okayasu and Bun Tsuchiya

Atoms 2021, 9(3), 36; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms9030036 - 23 Jun 2021

Cited by 6 | Viewed by 1895

Abstract

It has been observed that modifications of non-metallic solids such as sputtering and surface morphology are induced by electronic excitation under high-energy ion impact and that these modifications depend on the charge of incident ions (charge-state effect or incident-charge effect). A simple model is described, consisting of an approximation to the mean-charge-evolution by saturation curves and the charge-dependent electronic stopping power, for the evaluation of the relative yield (e.g., electronic sputtering yield) of the non-equilibrium charge incidence over that of the equilibrium-charge incidence. It is found that the present model reasonably explains the charge state effect on the film thickness dependence of lattice disordering of WO₃. On the other hand, the model appears to be inadequate to explain the charge-state effect on the electronic sputtering of WO₃ and LiF. Brief descriptions are given for the charge-state effect on the electronic sputtering of SiO₂, UO₂ and UF₄, and surface morphology modification of poly-methyl-methacrylate (PMMA), mica and tetrahedral amorphous carbon (ta-C). Full article

(This article belongs to the Special Issue Charge-State Evolution in Ion-Atom/Solid Collisions)

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