1. Institute of Experimental Physics I and Center for Materials Research (ZfM/LaMa) Justus Liebig University Giessen Heinrich‐Buff‐Ring 16 Giessen D‐35392 Germany
2. Department of Chemistry and Material Sciences Center Philipps‐Universität Marburg Hans‐Meerwein‐Straße Marburg D‐35043 Germany
3. Department of Physics and Center for Optoelectronics and Photonics Paderborn (CeOPP) Paderborn University Warburger Strasse 100 Paderborn D‐33098 Germany
4. School of Physics and Astronomy University of Minnesota 116 Church Street S.E. Minneapolis MN 55455 USA
5. Wyant College of Optical Sciences The University of Arizona 1630 E. University Blvd. Tucson AZ 85721 USA