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：

---

慢速质子、氘子和氦离子的实验性 EUROFER97 电子截止截面


慢速质子、氘子和氦离子的实验电子截止截面EUROFER97是通过反向散射实验推导出来的，这些超薄膜堆栈是通过硅衬底上的体EUROFER97和钨的磁控溅射再沉积的超薄膜堆栈以及使用飞行时间低能离子散射 （ToF-LEIS） 的体EUROFER97。采用了两种不同的实验方法。在绝对测量中，将超薄膜堆栈记录的光谱中从 W 层反向散射的离子能量与相同实验条件下来自体 W 的信号进行了比较。在相对测量中，比较了使用相同实验条件的体EUROFER97和铜参比样品的光谱强度。在这两种方法中，将能量转换光谱与蒙特卡洛模拟进行比较，以进行定量分析并解释多重和多重散射的贡献。将推导出的 EUROFER97 电子停止截面与 SRIM 使用布拉格的阻止功率加法规则的预测进行了比较，并且最近结合了 RT-TDDFT 和 MD 模拟，用于非通道几何形状中块状 Fe 中的质子。讨论了两种方法的结果之间的差异。