1. Department of Chemistry, The Ohio State University, Columbus, Ohio 43210-1185, United States
2. Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210-1117, United States
3. Leibniz Institute for
Solid State and Materials Research Dresden IFW, D-01171 Dresden, Germany
4. Institute for Solid State physics, Technische Universität Dresden, D-01062 Dresden, Germany