1. Department of Materials Science and Engineering, Division of Nanotechnology and Functional Materials, Uppsala University, Box 35, SE-751 03 Uppsala, Sweden
2. Materials Theory Division, Department of Physics and Astronomy, Ångström Laboratory, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
3. Department of Engineering and Physics, Karlstad University, 651 88 Karlstad, Sweden
4. Department of Chemistry – BMC, Uppsala University, Box 576, SE-751 23 Uppsala, Sweden