1. Institute of Organic Chemistry, Julius-Maximilian University of Würzburg, 97074 Würzburg, Germany
2. Experimental Physics VI, Julius-Maximilian University of Würzburg, 97074 Würzburg, Germany
3. Wilhelm Conrad Röntgen Research Centre for Complex Material Systems (RCCM), Julius-Maximilian University of Würzburg, 97074 Würzburg, Germany
4. Experimental Physics III, Julius-Maximilian University of Würzburg, 97074 Würzburg, Germany
5. Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Wien, Austria
6. Ioffe Physical-Technical Institute, 194021 St. Petersburg, Russia
7. Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg, Germany