1. University of Wrocław, Faculty of Chemistry, 14 F. Joliot-Curie, 50-383 Wrocław, Poland, National Institute of Chemistry, Hajdrihova 19, SI-1001, Ljubljana, Slovenia, Université Pierre et Marie Curie 4, Laboratoire de Physique Théorique de la Matière Condenseé, 4 Place Jussieu, 75005 Paris, France, and Dipartimento di Fisica, and CNISM unit 1, Università di Roma ‘La Sapienza’, Piazzale Aldo Moro 5, 00185 Roma, Italy