Abstract
We present electronic stopping power data for H and He ions in Zn and In obtained from backscattering experiments in the range of low velocities; for In data are obtained up to the stopping maximum. These results in combination with previous data are analyzed to unravel the influence of electrons in electronic stopping of slow light ions. We report on a systematic difference between the stopping behavior of H and He ions at velocities below 0.2 a.u. Furthermore, we find that the -band offset is not correlated to the velocity at which deviations from velocity proportionality occur. This observation is in contrast to the state-of-the-art models of electronic stopping based on electron-hole pair excitation in a binary Coulomb collision. In this regard we discuss the possible relevance of electron promotion processes in atomic collisions.
3 More- Received 29 January 2014
- Revised 5 June 2014
DOI:https://doi.org/10.1103/PhysRevA.90.042706
©2014 American Physical Society