1. Fraunhofer Center for Applied Nanotechnology CAN, Grindelallee 117, 20146 Hamburg, Germany
2. Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
3. Deutsches Elektronen-Synchrotron (DESY), Centre for X-ray and Nano Science (CXNS), Notkestrasse 85, 22607 Hamburg, Germany