1. Department of Physics, Stockholm University, Roslagstullsbacken 21, 10691 Stockholm, Sweden
2. Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
3. Department of Chemistry, POSTECH, Pohang 37673, Republic of Korea
4. Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
5. Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
6. Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany