1. University of Southern Denmark; Department of Physics; Chemistry and Pharmacy; Nucleic Acid Center; Campusvej 55 5230 Odense M Denmark
2. Technical University of Denmark; Department of Chemistry; Kemitorvet 2800 Kongens Lyngby Denmark
3. Aarhus University; Interdisciplinary Nanoscience Center; Gustav Wieds Vej 14 8000 Aarhus C Denmark