Energy spectra of keV ions interacting with self-supporting foils of Au and W were recorded with a Time-of-Flight Medium-Energy Ion Scattering system in different backscattering and transmission geometries in an otherwise identical experimental setup. For He ions transmitted through Au spectra of detected particles depending on geometry show two distinct components, i.e. different energy loss distributions in the film, whereas for protons no such phenomenon was observed. The two components in the spectrum of transmitted He could be attributed to impact parameter dependent energy loss, being more prominent for He than for protons. The main origin of the necessary impact parameter selection along different trajectories is expected to be texture in the Au-foils. Electronic stopping powers obtained from both, most probable energy loss in transmission and best fits to spectrum width in backscattering are in agreement within experimental uncertainties. This observation applied for all investigated combinations of projectile and target material.

keV离子与Au和W的自支撑箔相互作用的能谱是通过飞行时间中能离子散射系统在不同的反向散射和透射几何结构中以其他相同的实验设置记录的。对于通过He的Au离子传输的He离子，根据几何形状显示出两个截然不同的成分，即薄膜中不同的能量损失分布，而对于质子，则未观察到这种现象。透射氦气光谱中的两个成分可归因于与冲击参数有关的能量损失，对于氦气而言，它比质子更为突出。沿不同轨迹选择必要的冲击参数的主要来源预计是金箔中的织构。从两者获得的电子制动力，在实验不确定性范围内，在传输中最可能发生的能量损失以及在反向散射中最适合频谱宽度的问题是一致的。该观察结果适用于所有研究的弹丸和靶材组合。