1. Max Planck Institute of Quantum Optics, 85748 Garching, Germany
2. Department of Experimental Physics, Ludwig-Maximilians-University Munich, Am Coulombwall 1, 85748 Garching, Germany
3. Department of Chemistry, Technical University of Munich, Lichtenbergstr. 4, 85747 Garching, Germany
4. Department of Anesthesiology and Intensive Care Medicine, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany