1. Department of Inorganic ChemistryRWTH Aachen University Landoltweg 1 52074 Aachen Germany
2. Department of PhysicsUniversity of Hamburg Luruper Chaussee 149 22761 Hamburg Germany
3. Department of Chemistry and PharmacyFriedrich-Alexander-University of Erlangen-Nürnberg Egerlandstrasse 1 91058 Erlangen Germany
4. Deutsches Elektronen-Synchrotron DESY Notkestrasse 85 22607 Hamburg Germany
5. Institute of Bioorganic ChemistryHeinrich Heine University Düsseldorf at Forschungszentrum Jülich 52425 Jülich Germany
6. Institute of Bio- and Geoscience (IBG-1: Biotechnology)Forschungszentrum Jülich GmbH 52425 Jülich Germany