1. Department of Chemistry, Technical University of Denmark, 2800 Kgs. Lyngby,
Denmark
2. Departament de
Física
i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Barcelona 08034, Spain
3. Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215,
United States
4. Chemistry
Department, Ecole Normale Supèrieure, UMR ENS-CNRS-UPMC
8640, 24 Rue Lhomond, 75005 Paris, France