1. Laboratory for fundamental BioPhotonics, Institutes of Bioengineering and Materials Science and Engineering, School of Engineering, and Lausanne Centre for Ultrafast Science, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
2. Department of Chemistry, Pennsylvania State University, University Park, PA 16802, USA.
3. Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA 16802, USA.
4. Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA.
5. Laboratory of Computational Science and Modeling, Institute of Materials Science and Engineering, School of Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
6. Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK.