[1] Univ Paris 06, CNRS, UMR 7197, Lab Reactivite Surface, F-94200 Ivry, France
[2] Univ Autonoma Barcelona, Dept Quim, Bellaterra 08193, Spain
[3] Univ Turin, Dipartimento Chim, I-10125 Turin, Italy
[4] Univ Turin, NIS Ctr Excellence, I-10125 Turin, Italy