1. Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark
2. MAX IV laboratory, Lund University, Fotongatan 2, SE 211 00 Lund, Sweden
3. Department of Physics, The Technical University of Denmark, Fysikvej 3, DK-2880 Kgs. Lyngby, Denmark