Photoelectron spectra of Nan− and Cun− with n = 20–40: observation of surprising similarities O. Kostko, N. Morgner, M. Astruc Hoffmann and B. von Issendorff Eur. Phys. J. D, 34 1-3 (2005) 133-137 Published online: 13 July 2005 DOI: 10.1140/epjd/e2005-00099-3