1. Department of Chemistry “U. Schiff”, University of Florence and INSTM, 50019 Sesto Fiorentino, Florence, Italy
2. Department of Chemistry and Industrial Chemistry, University of Pisa and INSTM, 56124 Pisa, Italy
3. ICCOM - CNR and INSTM, 50019 Sesto Fiorentino, Florence, Italy
4. Instituto de Nanociencia, Nanotecnología y Materiales Moleculares and Depto. de Física Aplicada, Universidad de Castilla-La Mancha, Campus de la Fábrica
de Armas, 45071 Toledo, Spain
5. Department of Physics, University of Milan and INSTM, 20133 Milan, Italy
6. Department of Physics and Astronomy, University of Florence, 50019 Sesto Fiorentino, Florence, Italy
7. Department of Physics and INSTM, University of Pavia, 27100 Pavia, Italy
8. IMEM - CNR Parco Area delle Scienze, 43124 Parma, Italy