1. Department of Chemistry KU Leuven Celestijnenlaan 200F Leuven 3001 Belgium
2. KU Leuven Core facility for Advanced Spectroscopy Celestijnenlaan 200F Leuven B‐3001 Belgium
3. CNR‐IOM‐OGG, c/o ESRF, LISA CRG 71 Avenue des Martyrs Grenoble 38043 France
4. Quantum Solid‐State Physics, Department of Physics and Astronomy KU Leuven Leuven 3001 Belgium
5. Department of Microbial and Molecular Systems KU Leuven Celestijnenlaan, 200F‐box 2454 Leuven 3001 Belgium
6. Department of Physical Chemistry Faculty of Pharmacy University of Castilla‐La Mancha, José María Sánchez Ibañez Albacete 02071 Spain
7. Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany