1. Department of Physics Technische Universität Kaiserslautern Erwin-Schrödinger-Str. 46 67663 Kaiserslautern Germany
2. Institute of Inorganic Chemistry Karlsruhe Institute of Technology Engesserstr. 15 76131 Karlsruhe Germany
3. Advanced Photon Source Argonne National Laboratory 9700 South 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 Germany