1. Institute of Physical and Theoretical Chemistry, University of Würzburg, 97074 Würzburg, Germany
2. Institute of Inorganic Chemistry, University of Würzburg, 97074 Würzburg, Germany
3. Synchrotron SOLEIL, 91192 Gif-sur-Yvette, France
4. Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam-Golm, Germany
5. Dipartimento di Fisica, Politecnico di Milano, 20133 Milano, Italy