1. Research Group EPR Spectroscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
2. Department of Chemistry, Technical University of Munich, Garching, Germany
3. Quantum Control (PGI-8), Peter Grünberg Institute, Forschungszentrum Jülich GmbH, Jülich, Germany
4. Current address: Department of Chemistry, Technical University of Munich, Lichtenbergstr 4, 85747 Garching, Germany.
5. Munich Center for Quantum Science and Technology (MCQST), München, Germany
6. Department of Chemistry, Georg-August-Universität Göttingen, Göttingen, Germany