1. Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
2. Department of Chemistry, University of Hamburg, 20146 Hamburg, Germany
3. Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Straße 7, 60438 Frankfurt, Germany
4. Department of Chemistry, University of Zurich, 8057 Zurich, Switzerland
5. Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10, 18221 Prague 6, Czech Republic