1. Department
of Physics and Astronomy, University of Turku, FIN-20014 Turku, Finland
2. Departamento
de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
3. Instituto Madrileño de Estudios Avanzados en Nanociencia, Cantoblanco, 28049 Madrid, Spain
4. Department
of Physics, University of Oulu, FIN-90014 Oulu, Finland
5. MAX
IV Laboratory, Lund University, P.O. Box 118, SE-22100 Lund, Sweden
6. Department
of Nuclear Medicine and Radiobiology, Faculty of Medicine, University of Sherbrooke, J1K 2R1 Sherbrooke, Quebec, Canada
7. Atomic and
Molecular Physics, Royal Institute of Technology KTH, SE-10044 Stockholm, Sweden