1. Institute for Inorganic Chemistry Kiel University Max-Eyth-Str. 2 4118 Kiel Germany
2. Institute for Materials Science Kiel University Kaiserstr. 2 24143 Kiel Germany
3. Institute for Photon Science and Synchrotron Radiation Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
4. Institute for Applied Materials Karlsruhe Institute of Technology P.O. box 3640 76021 Karlsruhe Germany
5. Max Planck Institute for Solid State Research Heisenbergstrasse 1 70569 Stuttgart Germany