Influence of the excitation threshold of d electrons on electronic stopping of slow light ions

D. Goebl, W. Roessler, D. Roth, and P. Bauer
Phys. Rev. A 90, 042706 – Published 16 October 2014

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 d 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 d-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.

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  • Received 29 January 2014
  • Revised 5 June 2014

DOI:https://doi.org/10.1103/PhysRevA.90.042706

©2014 American Physical Society

Authors & Affiliations

D. Goebl, W. Roessler, D. Roth, and P. Bauer*

  • Institut für Experimentalphysik, Abteilung für Atom- und Oberflächenphysik, Johannes Kepler University Linz, Altenberger Straße 69, 4040 Linz, Austria

  • *peter.bauer@jku.at

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Vol. 90, Iss. 4 — October 2014

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