1. Helmholtz Institute Ulm (HIU) Helmholtzstrasse 11 D-89081 Ulm Germany
2. Karlsruhe Institute of Technology (KIT) P.O. Box 3640 D-76021 Karlsruhe Germany
3. Institute of Surface Chemistry and Catalysis Ulm University Albert-Einstein-Allee 47 D-89081 Ulm Germany
4. Central Facility for Electron Microscopy Group of Electron Microscopy of Materials Science Ulm University Albert-Einstein-Allee 11 89081 Ulm Germany