SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Focus Session: Ion Beam Interaction with Surfaces and 2D Materials I

O 5.1: Topical Talk

Montag, 27. März 2023, 10:30–11:00, GER 38

Highly charged, slow and swift ions interacting with surfaces and 2D materials — •Marika Schleberger — Fakultät für Physik, Universität Duisburg-Essen and CENIDE

Ion beams are a proven, versatile, and efficient tool for material modification and in particular for defect engineering. An ion stores its energy in the form of kinetic (E_kin) and so-called potential energy (E_pot), the latter corresponding to the energy required to create its respective charge state. At low velocities, the energy deposition is based on elastic collisions leading to linear sputtering cascades or collision peaks in the volume of the material, and ultimately to the emission of atoms. At higher kinetic energy, electronic excitations and ionizations are dominant. The release of potential energy again occurs via electronic processes that can also lead to the emission of atoms from the target material. By adjusting these two parameters, E_pot and E_kin, one can in principle fine-tune the nature of the interaction and thus the corresponding material changes. However, the basic mechanisms of defect formation through electronic excitation have not yet been clarified. We have introduced 2D materials as target material for the study of ion-solid-interactions. Due to their well-defined thickness, the flexible preparation and last but not least the wide range of available materials, they are an ideal target material for our task. We have studied the interaction of ions of different types with surfaces and 2D materials and I will present key results.