1. DTU Chemistry − Department of Chemistry, Technical University of Denmark, Kemitorvet Bldg 207, DK-2800 Kongens Lyngby, Denmark
2. Institut für Physik, Universität Rostock, Albert-Einstein-Str. 23-24, D-18059 Rostock, Germany
3. Istituto Officina dei Materiali IOM−CNR and Dipartimento di Scienze Chimiche e Farmaceutiche, Università degli Studi di Trieste, I-34121 Trieste, Italy
4. Department of Chemistry, Norwegian University of Science and Technology, N-7491 Trondheim, Norway