1. Faculty of Physics, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
2. Department of Chemistry, Paderborn University, Warburger Straße 100, 33098 Paderborn, Germany
3. Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences and Arts, Interaktion 1, 33619 Bielefeld, Germany
4. Faculty of Chemistry, Physical and Biophysical Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
5. Department of Physics and Astronomy, University of Hawaii, Watanabe Hall, 2505 Correa Road, Honolulu, HI 96822, USA