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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. B, Beam Interactions with Materials and Atoms >Delta-electron spectra, inelastic cross sections, and stopping powers of ions in silicon: Comparison between different models
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Delta-electron spectra, inelastic cross sections, and stopping powers of ions in silicon: Comparison between different models

机译：硅中离子的Delta电子光谱，非弹性截面和离子的终止能力：不同模型之间的比较

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摘要

The energy spectrum of the δ-electrons ejected by an ion moving in the bulk of a solid is the origin of numerous effects which follow the transport of these electrons. This spectrum cannot be measured directly. Therefore, it should be derived theoretically. The present work aims to investigate the uncertainties introduced when applying commonly used theoretical approaches like BEA, CDFT, and PWBA to calculate δ-electron spectrum. Our calculations show that, above a certain δ-electron energy, the energy spectra of the δ-electrons obtained using the various approaches behave similarly. Below this energy, the spectra found using these approaches differ significantly due to the manner in which the solid state character of the target material is taken into account in each approach. This results in differences in the inelastic cross sections and stopping powers for the ions, which in turn result in different ion track structures. Also discussed in this paper is the effect of the uncertainty in the effective ion charge on the accuracy of ion track calculations. The results obtained for silicon allow estimating the possible uncertainties of the calculated ion track properties and related effects.
机译：离子在固体中移动时所发射的δ电子的能谱是跟随这些电子传输的众多效应的起源。该光谱不能直接测量。因此，应该从理论上推导它。本工作旨在调查在应用诸如BEA，CDFT和PWBA等常用理论方法来计算δ电子谱时引入的不确定性。我们的计算表明，在一定的δ电子能量之上，使用各种方法获得的δ电子的能谱表现相似。在该能量以下，由于在每种方法中考虑目标材料的固态特性的方式，使用这些方法发现的光谱差异很大。这导致了离子的非弹性横截面和阻止能力的差异，进而导致了不同的离子轨迹结构。本文还讨论了有效离子电荷的不确定性对离子轨迹计算精度的影响。对于硅获得的结果可以估算出所计算的离子轨迹特性和相关效应的可能不确定性。

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