1. Jülich Centre for Neutron Science (JCNS-1/IBI-8), Forschungszentrum Jülich, Jülich 52425, Germany
2. Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C 1), Forschungszentrum Jülich, Jülich 52425, Germany
3. Institute of Physical Chemistry, RWTH Aachen University, Aachen 52074, Germany