Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 4: New Methods: Experiments

O 4.4: Vortrag

Montag, 18. März 2024, 11:15–11:30, MA 005

Energy Distributions of Material Sputtered under Swift Heavy Ion Bombardment — Tobias Heckhoff, •Lars Breuer, Marika Schleberger, and Andreas Wucher — Universität Duisburg-Essen, Fakultät für Physik and CENIDE, Duisburg, Germany

Ion-surface interactions represent a well-established field of research, serving as the foundation for numerous analytical and modification techniques. Despite decades of investigation, certain fundamental questions remain unanswered. These unresolved inquiries include phenomena like the secondary ion formation and the velocity distributions of particles sputtered during swift heavy ion bombardment.

While conventional laboratory-based ion sources can be used to determine the energy distributions of sputtered material by using short ion pulses, this approach is inadequate for prolonged pulses, as delivered by particle accelerators like the UNILAC at GSI.

We have developed a new measurement protocol that has been successfully applied in experiments involving various target materials, including metals, insulators, and organic molecules. We found that the energy distributions show a behavior where in all cases the maximum of the distribution is shifted to smaller energies and follows a different shape compared to the Thompson distribution of material sputtered under nuclear sputtering conditions.