Optical properties of silver clusters formed by ion irradiation J. C. Pivin, M. A. García, H. Hofmeister, A. Martucci, M. Sendova Vassileva, M. Nikolaeva, O. Kaitasov and J. Llopis Eur. Phys. J. D, 20 2 (2002) 251-260 Published online: 19 July 2002 DOI: 10.1140/epjd/e2002-00130-3