1. Physical Chemistry 1, Center for Chemistry and Chemical Engineering, P.O. Box 124, Lund University, Lund SE-221 00, Sweden, Department of Chemical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, 84105 Beer-Sheva, Israel, Departamento de Química, Universidade de Coimbra, 3049 Coimbra, Portugal, and Department of Chemistry and Process Technology, Chemistry, Mid Sweden University, SE-851 70 Sundsvall, Sweden