Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 56: Poster Session - Nanostructures at Surfaces: Dots, Particles, Clusters

O 56.3: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/2OG

Irradiation of Au-nano-islands with slow highly charged ions and characterization with AFM and SEM — •Gabriel L. Szabo1, Janas Arkadiusz3, Benedykt R. Jany3, Franciszek Krok3, and Richard A. Wilhelm1,21Institute of Applied Physics, TU Wien, 1040 Vienna, Austria — 2Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany — 3Institute of Physics, Jagiellonski University, 30-348 Kraków, Poland

Impacts of slow highly charged ions (HCIs) onto a target surface can lead to a change of the material’s structure, such as e.g. phase transitions and nano-structures. Responsible for this transformation is the excitation of electrons of the target material due to the neutralization of the ion in the area of the ion impact and subsequent lattice heating mediated by electron-phonon coupling. So far, potential energy effects have not been observed on metallic target materials. This is due to the high electronic conductivity of conductors, which results in a fast dissipation of the electrical excitations induced by the potential energy of the impinging HCI. For a better understanding of this processes, single metallic nano-islands were irradiated. Special emphasize is put on the lateral size of those structures below which the electronic excitation cannot dissipate fast enough and stays confined for a longer period of time. In case of an existing size threshold, nano-structuring due to potential energy effects can be expected. In this work, Au-nano-islands were irradiated by 180 keV Xe40+ ions. The samples were measured on the same spot with AFM and SEM, before and after irradiation.

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