Regensburg 2016 – scientific programme
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DS: Fachverband Dünne Schichten
DS 52: Ion and Electron Beam Induced Processes
DS 52.4: Talk
Thursday, March 10, 2016, 17:45–18:00, H11
Energy loss and charge exchange of slow highly charged ions in graphene — •Richard Wilhelm1, Elisabeth Gruber2, Valerie Smejkal2, Janine Schwestka2, Roland Kozubek3, Anke Hierzenberger3, Marika Schleberger3, Stefan Facsko1, and Friedrich Aumayr2 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2TU Wien, Institut für Angewandte Physik, Wien, Österreich — 3Universität Duisburg-Essen, FB Physik, Duisburg, Deutschland
Slow highly charged ions (e.g. Xeq+ with q=10−40) enable studies of ion-solid interaction far from equilibrium. These ions neutralize quickly in a solid, i.e. typically within the first nm of the solid. The neutralization is associated with the deposition of the ion’s potential energy in a small volume (nm3) during a short time (fs). To study the neutralization dynamics in more detail and also to study charge state enhanced kinetic energy loss we used graphene as the thinnest target material there is for ion transmission experiments. We observe even in freestanding single layer graphene strong charge exchange and extracted a surprisingly short neutralization time of around 2-3 fs. Additionally we see a strong enhancement of the energy loss (stopping) with charge state and with charge exchange.