1. CFisUC, Department of Physics; University of Coimbra; Rua Larga 3004-516 Coimbra Portugal
2. IUCA; University of Zaragoza, EPS, Carretera; de Cuarte s/n 22071 Huesca Spain
3. Van ‘t Hoff Institute for Molecular Sciences; University of Amsterdam; Science Park 904 1098 HX Amsterdam The Netherlands
4. Current address: Max Planck Institute for the Structure and Dynamics of Matter; Luruper Chaussee 149, Geb.99. 22761 Hamburg Germany
5. CQC; Chemistry Department, University of Coimbra; Rua Larga 3004-535 Coimbra Portugal