In the scattering and stopping of heavy ions on a few surface layers in solids, contributions of the electronic and nuclear energy losses can become comparable. In this work we present a study of 0.6–5-keV Ar ion scattering on a Cu (100) surface. Energy-loss spectra were measured and displayed some changes as the incident ion energy changes. Thus, a structured spectrum is observed at the higher energies. We analyze the characteristics of the spectra and contributions from the nuclear and electronic energy-loss components using both a Monte Carlo kinetics simulation assuming an averaged electron density and a semiclassical deterministic simulation with an inhomogeneous electron density in the solid. The general features of the experimental spectra were well reproduced, and semiclassical simulations allow us to identify contributions from trajectories coming from below and on top of the surface atomic layer. The relative contribution of nuclear energy loss and electronic energy loss (EEL) were delineated and a more refined analysis of the EEL for different trajectories is presented.

中文翻译：

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在Cu（100）表面缓慢Ar离子散射中的核能量损失与电子能量损失：实验和模拟

在重离子在固体中的几个表面层上的散射和阻止中，电子和核能损失的贡献可以变得可比。在这项工作中，我们提出了在Cu（100）表面上0.6-5keV Ar离子散射的研究。测量了能量损失谱，并显示了随入射离子能量变化的一些变化。因此，在较高的能量下观察到结构化的光谱。我们使用蒙特卡洛动力学模拟（假设平均电子密度）和半经典确定性模拟（固体中电子密度不均匀）来分析光谱特征以及核和电子能量损失成分的贡献。实验光谱的一般特征被很好地再现，半经典模拟使我们能够识别来自表面原子层下方和上方的轨迹的贡献。描绘了核能损失和电子能损失（EEL）的相对贡献，并对不同轨迹的EEL进行了更精细的分析。