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 S. Cass Avenue Argonne IL 60439 USA
4. Department of Geology University of Illinois at Urbana-Champaign Urbana IL 61801 USA
5. Department of Physics Northern Illinois University 1425 W. Lincoln Hwy. DeKalb IL 60115-2828 USA
6. Institute of Nanotechnology Karlsruhe Institute of Technology 76131 Karlsruhe Germany