1. Laboratory of Magnetic Resonance, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
2. Laboratory of Photonics and Interfaces, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
3. Technology Innovation Division, Panasonic Corporation, Osaka 570-8501, Japan
4. Laboratory of Computational Chemistry and Biochemistry, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
5. Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw 01-224, Poland
6. Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
7. Laboratory of Photomolecular Science, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
8. Laboratory of Chemistry and Applied Biosciences, ETH Zurich, 8092 Zurich, Switzerland