1. Departament ECM
2. Facultat de Física, and IN2UB
3. Universitat de Barcelona
4. 08028 Barcelona, Spain
5. Department of Chemistry and Biochemistry
6. California State University at Northridge
7. Northridge, USA
8. Laboratory of Theoretical Physical Chemistry
9. Institut des Sciences et Ingénierie Chimiques
10. Swiss Federal Institute of Technology Lausanne (EPFL)
11. CH-1015 Lausanne, Switzerland