1. Department of Chemistry Philipps University Marburg DE‐35032 Marburg Germany
2. Scientific Center of Materials Science Philipps University Marburg DE‐35032 Marburg Germany
3. Institute of Physical Chemistry Justus‐Liebig University Giessen DE‐35392 Giessen Germany
4. Center for Materials Research (ZfM) Justus‐Liebig University Giessen DE‐35392 Giessen Germany
5. Institute for Theoretical Physics Justus‐Liebig University Giessen DE‐35392 Giessen Germany
6. Light Technology Institute Karlsruhe Institute of Technology DE‐76131 Karlsruhe Germany