1. Department of ChemistryJohannes Gutenberg University of Mainz Duesbergweg 10–14 55128 Mainz Germany
2. Division 1.2 BiophotonicsFederal Institute for Materials Research and Testing (BAM) Richard Willstätter-Straße 11 12489 Berlin Germany
3. Institut für Chemie und BiochemieFreie Universität Berlin Arnimallee 22 14195 Berlin Germany
4. Institute for Physics and Department of Life, Light and MatterUniversity of Rostock 18051 Rostock Germany