1. Institute of Organic Chemistry Clausthal University of Technology Leibnizstr. 6 Germany
2. Institute of Technical Chemistry Clausthal University of Technology Arnold‐Sommerfeld‐Str. 4 38678 Clausthal‐Zellerfeld Germany
3. Fiber Optical Sensor Systems Fraunhofer Heinrich Hertz Institute HHI Am Stollen 19 H 38640 Goslar Germany
4. Institute of Energy Research and Physical Technologies Clausthal University of Technology Am Stollen 19 B 38640 Goslar Germany