1. Central Facility for Electron Microscopy GFE
2. RWTH Aachen University
3. 52074 Aachen
4. Germany
5. Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons ER-C
6. Institute of Energy and Climate Research IEK-1
7. Forschungszentrum Jülich GmbH
8. 52425 Jülich
9. Faculty of Science and Technology