1. LENS European Laboratory for Non-linear Spectroscopy Via N. Carrara 1 I-50019 Sesto Fiorentino Firenze Italy
2. ICCOM-CNR Institute of Chemistry of OrganoMetallic Compounds National Research Council of (Italy) Via Madonna del Piano 10 I-50019 Sesto Fiorentino Firenze Italy
3. Department of Chemistry and INSTM University of Pavia Via Taramelli 16 27100 Pavia Italy
4. ESRF, European Synchrotron Radiation Facility 71 Avenue des Martyrs, CS40220 38043 Grenoble Cedex 9 France
5. Dipartimento di Chimica “Ugo Schiff” dell'Università degli Studi di Firenze Via della Lastruccia 3 I-50019 Sesto Fiorentino Firenze Italy