1. Institute of Chemical Physics, Vilnius University, Sauletekio av. 3, LT-10257 Vilnius, Lithuania
2. Eduard-Zintl Institute for Inorganic and Physical Chemistry, University of Technology Darmstadt, Alarich-Weiss-Strasse 8, D-64287 Darmstadt, Germany
3. Faculty of Chemistry, Adam Mickiewicz University, Umultowska ul. 89b, PL-61614 Poznań, Poland
4. Institute for Materials Science, University of Technology Darmstadt, Alarich-Weiss-Strasse 2, D-64287 Darmstadt, Germany