1. Institute for Solid State Research, Leibniz-Institute for Solid State and Materials Research Dresden, Helmholtzstraße 20, D-01069 Dresden, Germany
2. Institute for Solid State and Materials Physics, Technical University Dresden, D-01062 Dresden, Germany
3. Faculty of Agriculture Environment and Chemistry, University of Applied Sciences Dresden, D-01069 Dresden, Germany
4. Department of Chemistry, University of Oslo, NO-0315 Oslo, Norway