Size-effects in clusters and free nanoparticles probed by soft X-rays R. Lewinski, C. Graf, B Langer, R. Flesch, H. Bresch, B. Wassermann and E. Rühl Eur. Phys. J. Special Topics, 169 (2009) 67-72 Published online: 17 March 2009 DOI: 10.1140/epjst/e2009-00974-y