SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 24: Poster: Ion Beam Interaction with Surfaces and Interfaces

O 24.4: Poster

Montag, 27. März 2023, 18:00–20:00, P2/EG

Non-ambient Raman spectroscopy combined with ion bombardment — •André Maas, Lucia Skopinski, Stephan Sleziona, Marika Schleberger, and Lars Breuer — Universität Duisburg-Essen, Fakultät für Physik and CENIDE, Germany

Spectroscopic and electronic characterization of materials under non-ambient condition is an ongoing challenge. Irradiation-induced defects under ambient conditions are usually saturated with adsorbates. The direct analysis of the effects caused by unsaturated defects on the crystal structure and its electronic and optoelectronic properties is however essential to gain a deeper understanding of defect generation, defect saturation and the corresponding relaxations of the lattice due to adsorbates.

A novel experimental setup is presented that allows ion bombardment with two different ion sources and subsequent characterization of samples by a mobile Raman spectrometer in ultra high vacuum. The interaction of highly charged ions (Xe¹⁷⁺ - Xe⁴⁰⁺ at around E_kin=200 keV) from an electron beam ion source (EBIS) can be studied at the University of Duisburg-Essen. A second experimental setup utilizes the swift heavy ions (up to 14.8 MeV/u for ²³⁸U⁹²⁺) from the CRYRING@ESR at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt for defect generation.

Another experiment uses a custom-built cell that allows for electrical and optical characterization of samples under high vacuum and at low temperatures (≃ 77 K).