1. Institut für Organische Chemie, Universität Regensburg, Universitätsstraße 31, 93040 Regensburg, Germany
2. Department of Physics, Università di Pavia, Via Bassi 6, 27100 Pavia, Italy
3. PhotoGreen Lab, Università di Pavia, Via Taramelli 12, 27100 Pavia, Italy