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O: Fachverband Oberflächenphysik
O 5: Focus Session: Ion Beam Interaction with Surfaces and 2D Materials I
O 5.3: Vortrag
Montag, 27. März 2023, 11:15–11:30, GER 38
Charge-state-enhanced ion sputtering of metallic gold nano islands — •Gabriel L. Szabo1, Benedykt R. Jany2, Helmut Muckenhuber1, Anna Niggas1, Markus Lehner1, Arkadiusz Janas2, Paul S. Szabo3, Antony George4, Ziyang Gan4, Andrey Turchanin4, Franciszek Krok2, and Richard A. Wilhelm1 — 1TU Wien, Institute of Applied Phyiscs, 1040 Vienna, Austria, EU — 2Jagiellonian University, Institute of Physics, 30-348 Kraków, Poland, EU — 3University of California, Space Sciences Laboratory, Berkeley 94720, USA — 4Friedrich Schiller University Jena, Institute of Physical Chemistry, 07743 Jena, Germany, EU
Irradiation of certain targets with slow highly charged ions (HCIs) can trigger phase transitions or nano-structure formation. The main driving force for these processes is the electronic excitation of the target’s electronic sub-system in close proximity of the impact triggered by the ion neutralization. Subsequent electron-phonon coupling mediates lattice heating of the target. So far charge state dependent erosion of metallic surfaces was not unambiguously shown. The potential energy stored in the HCI dissipates quickly before a transfer to the target’s atomic lattice can take place. By reducing the size of the target down to the nanometer regime, geometric confinement might prevent free electrons of the target to dissipate the electronic excitations on the fs time-scale. In this work we irradiated gold nano islands with Xeq+ (q=1,18,25,32,40) with a constant kinetic energy of 180 keV, which results in an erosion of the islands that is strongly enhanced by the potential energy deposition.