The Ernst Ruska-Centre (ER-C) for Microscopy and Spectroscopy with Electrons is a national user facility open to universities, research institutions and research laboratories in industry. Operational services of the ER-C are based on the guiding principle, that external users are accompanied by experienced scientists and technical support staff. The Ernst Ruska-Centre is run conjointly by two institutions, the Institute of Microstructure Research at Jülich Research Centre
and the Central Facility for Electron Microscopy at RWTH Aachen University
. The facility is located on the campus of the Jülich Research Centre, part of the Helmholtz Association
of German Research Centres.