1. Helmholtz-Zentrum Dresden - Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstr. 400, 01328 Dresden, Germany
2. Technische Universität Dresden, D-01062 Dresden, Germany
3. Lomonosov Moscow State University (MSU), Faculty of Physics, 119991 Moscow, Russia
4. Rossendorf Beamline, European Synchrotron Radiation Facility, F-38043 Grenoble, France