1. Laboratorio Nazionale TASC, INFM-CNR, S.S. 14 km 163.5 in Area Science Park, 34012 Trieste, Italy, Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, Vass. Constantinou 48 Avenue, 116 35 Athens, Greece, Dipartimento di Scienze Farmaceutica, Università di Trieste, Piazzale Europa 1, 34127 Trieste, Italy, Department of Chemistry, University of Nagoya, 464 8602 Nagoya, Japan, and Sincrotrone Trieste S.C.p.A., S.S. 14 Km 163.5 in Area Science Park, 34012 Trieste, Italy