Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 11: 2D Materials I: Electronic Structure, Excitations, etc. (joint session O/CPP/HL)

O 11.10: Talk

Monday, March 16, 2020, 13:00–13:15, WIL C107

Interaction of highly charged ions with single, bi- and trilayer graphene — •Anna Niggas¹, Janine Schwestka¹, Sascha Creutzburg², Benjamin Wöckinger¹, Tushar Gupta³, Bernhard C. Bayer-Skoff³, Friedrich Aumayr¹, and Richard A. Wilhelm^1,2 — ¹TU Wien, Institute of Applied Physics, Vienna, Austria — ²Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany — ³TU Wien, Institute of Materials Chemistry, Vienna, Austria

The interaction of highly charged ions (HCIs) with surfaces has been in the focus of many groups over the last decades. Recently, the rise of 2D materials has provided access to study the neutralisation dynamics of HCIs as they have not reached their equilibrium charge state inside atomically thin materials yet.

In our experiment, we use Xe ions (Xe¹⁺ to Xe⁴⁴⁺) with energies in the range of 1-400 keV as projectiles and we then record the exit charge states of the ions after transmission through 2D materials. Additionally, we are able to determine the energy loss during the interaction through time of flight measurements, the yield and energy of emitted secondary electrons and forward sputtered target atoms in coincidence.

We now focus especially on the dependence of the neutralisation process on the thickness of the target. Thus, we employ single, bi- and trilayer graphene to mimic graphite with adjustable thickness. In order to ensure that this target structure is not affected by contaminations, it is crucial to implement cleaning procedures. Possible in-situ techniques and their effects will also be discussed in this context.