Before revision: History The Helmholtz-Zentrum Berlin was created on 1 January 2009 by the merger of Hahn-Meitner-Institut Berlin (HMI) and Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung (BESSY) , thus bringing BESSY into the Helmholtz Association.
After revision: History Following the renaming of Hahn-Meitner-Institut Berlin GmbH to Helmholtz-Zentrum Berlin für Materialien und Energie GmbH on 5 June 2008, the legal merger of Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung (BESSY)