Appearance size of poly-anionic aluminum clusters, Alnz-, z = 2–5 Franklin Martinez, Steffi Bandelow, Christian Breitenfeldt, Gerrit Marx, Lutz Schweikhard, Frank Wienholtz and Falk Ziegler Eur. Phys. J. D, 67 2 (2013) 39 Published online: 06 March 2013 DOI: 10.1140/epjd/e2012-30265-3