1. Institut für
Anorganische
Chemie, Christian-Albrechts-Universität, Max-Eyth Straße 2, D 24118 Kiel, Germany
2. HASYLAB, DESY Hamburg, Notkestraße 85, 22607 Hamburg, Germany
3. Centre for Materials Science and
Nanotechnology/InGAP/Department of Chemistry, University of Oslo, Postbox 1033, Blindern, 0315 Oslo, Norway