1. Leibniz University Hannover, Institute of Inorganic Chemistry, Callinstraße 1, 30167 Hannover, Germany
2. Technische Universität Berlin, Institute for Optics and Atomic Physics, Sekr. EW 3-1, Hardenbergstraße 36, 10623 Berlin, Germany
3. European Synchrotron Radiation Facility, 71 Avenue des Martyrs, CS 40220, 38043 Grenoble Cedex 9, France