Optical and electrical properties of hydrogenated yttrium nanoparticles G. Bour, A. Reinholdt, A. Stepanov, C. Keutgen and U. Kreibig Eur. Phys. J. D, 16 1-3 (2001) 219-223 Published online: 15 September 2001 DOI: 10.1007/s100530170096