1. Institute of Materials Physics University of Göttingen Göttingen 37077 Germany
2. The International Center for Advanced Studies of Energy Conversion (ICASEC) University of Göttingen Göttingen 37077 Germany
3. Institute of Physical Chemistry University of Göttingen Göttingen 37077 Germany
4. 1st Physics Institute University of Göttingen Göttingen 37077 Germany
5. Institute for Theoretical Physics University of Göttingen Göttingen 37077 Germany