1. Department of Physics Technische Universität Kaiserslautern Erwin-Schrödinger-Str. 46 67663 Kaiserslautern Deutschland
2. Institute of Inorganic Chemistry Karlsruhe Institute of Technology Engesserstr. 15 76131 Karlsruhe Deutschland
3. Advanced Photon Source Argonne National Laboratory 9700 S. Cass Avenue Argonne IL 60439 USA
4. Department of Physics University of Alabama at Birmingham Birmingham AL 35294 USA
5. Institute of Nanotechnology Karlsruhe Institute of Technology 76021 Karlsruhe Deutschland