The experimental electronic stopping cross-section of EUROFER97 for slow protons, deuterons and helium ions is deduced from backscattering experiments from ultrathin film stacks redeposited by magnetron sputtering from bulk EUROFER97 and tungsten on silicon substrates as well as bulk EUROFER97 using Time-of-Flight Low-Energy Ion Scattering (ToF-LEIS). Two different experimental approaches were employed. In absolute measurements, the energy of ions backscattered from the W layer in spectra recorded for the ultrathin film stacks was compared to the signal from bulk W under the same experimental conditions. In relative measurements, the intensity of the spectra from bulk EUROFER97 and a Cu reference sample using the same experimental conditions were compared. In both approaches, the energy-converted spectra were compared to Monte-Carlo simulations for quantitative analysis and to account for the contributions of multiple and plural scattering. The deduced electronic stopping cross-sections of EUROFER97 are compared to predictions by SRIM using Bragg's rule of stopping power additivity and recently combined RT-TDDFT and MD simulations for protons in bulk Fe in the off-channeling geometry. The differences between the results from the two approaches are discussed.

中文翻译：

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EUROFER97 慢速质子、氘核和氦离子的实验电子停止截面


EUROFER97 对于慢速质子、氘核和氦离子的实验电子停止截面是根据硅基板上的块体 EUROFER97 和钨以及使用低飞行时间的块体 EUROFER97 通过磁控溅射重新沉积的超薄膜叠层的反向散射实验推导出来的-能量离子散射（ToF-LEIS）。采用了两种不同的实验方法。在绝对测量中，将超薄膜叠层记录的光谱中从钨层反向散射的离子能量与相同实验条件下来自体钨的信号进行比较。在相对测量中，比较了使用相同实验条件的散装 EUROFER97 和铜参考样品的光谱强度。在这两种方法中，将能量转换光谱与蒙特卡罗模拟进行比较，以进行定量分析，并解释多次和复数散射的贡献。将 EUROFER97 推导的电子阻止截面与 SRIM 使用布拉格阻止本领可加性规则以及最近结合 RT-TDDFT 和 MD 模拟对离沟道几何体中块状 Fe 中的质子进行的预测进行比较。讨论了两种方法的结果之间的差异。