1. Department of Molecular Theory and Spectroscopy, Max‐Planck‐Institut für Chemische Energiekonversion, Stiftstrasse 34–36, 45470 Mülheim an der Ruhr (Germany)
2. Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195‐1700 (USA)
3. Present address: Science Institute, University of Iceland, Dunhaga 3, 107 Reykjavik (Iceland)
4. Institut für Biochemie and BIOSS Centre for Biological Signalling Studies, Albert‐Ludwigs‐Universität Freiburg, Albertstrasse 21, 79104 Freiburg (Germany)
5. Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853 (USA)