1. Department of Chemistry and Applied Biosciences; ETH Zürich; Vladimir Prelog Weg 1-5 8093 Zürich Switzerland
2. Faculty of Physics; Vilnius University; Sauletekio 3 10257 Vilnius Lithuania
3. Current address: Department of Chemistry and Chemical Biology and The Baruch “60 Center for Biochemical Solar Energy; Rensselaer Polytechnic Institute; Troy NY 12180 USA
4. Current address: Laboratoire de Chimie des Processus Biologiques, CNRS UMR 8229; Collège de France; Université Pierre et Marie Curie; 11 Place Marcelin Berthelot 75231 Paris Cedex 05 France