1. Department of Chemistry University of Oslo P. O. Box 1033 Blindern 0315 Oslo Norway
2. Centre for Materials Science and Nanotechnology University of Oslo P.O. Box 1126 Blindern 0316 Oslo Norway
3. Department of Inorganic Spectroscopy Max Planck Institute for Chemical Energy Conversion Stiftstraße 34–36 45470 Mülheim an der Ruhr Germany