1. Laboratoire Collisions Agrégats Réactivité (LCAR), IRSAMC, Université de Toulouse, CNRS UMR 5589, Toulouse, France
2. Departament FQA, Facultat de Física, Universitat de Barcelona, Barcelona, Spain
3. Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, Barcelona, Spain
4. CNR–ISTM, Via Golgi 19, 20133 Milano, Italy
5. Laboratory of Molecular Nanodynamics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland