1. Department of Life Sciences and Chemistry; Jacobs University; P.O. Box 750 561 28725 Bremen Germany
2. Forschungszentrum Jülich; Peter Grünberg Institute; PGI-6 52425 Jülich Germany
3. Nikolaev Institute of Inorganic Chemistry; Prospekt Lavrentyeva 3 630090 Novosibirsk Russia
4. Department of Physics and Earth Sciences; Jacobs University; P.O. Box 750 561 28725 Bremen Germany
5. Key Laboratory of Cluster Science, Ministry of Education of China; Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry; Beijing Institute of Technology; Beijing 100081 PR China
6. Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie; Universität Leipzig; Linnéstr. 2 04103 Leipzig Germany
7. Université Paris-Sud; Laboratoire de Chimie-Physique; UMR 8000 CNRS 91405 Orsay France