Photoelectron spectra of Nan− and Cun− with n = 20–40: observation of surprising similaritiesO. Kostko, N. Morgner, M. Astruc Hoffmann and B. von IssendorffEur. Phys. J. D, 34 1-3 (2005) 133-137DOI: https://doi.org/10.1140/epjd/e2005-00099-3