1. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
2. Laboratoire Aimé Cotton-UMR 9188 CNRS, Université Paris-Sud 11 and Ecole Normale Supérieure Cachan, 91405 Orsay, France
3. Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742-2021, USA
4. Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742-2021, USA
5. Molecular and Laser Physics, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6265 AJ Nijmegen, The Netherlands
6. Theoretical Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6265 AJ Nijmegen, The Netherlands
7. Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218-2685, USA