Structure and optical properties of Na clusters deposited on MgO(001) M. Bär, L. V. Moskaleva, M. Winkler, P.-G. Reinhard, N. Rösch and E. Suraud Eur. Phys. J. D, 45 3 (2007) 507-514 Published online: 20 June 2007 DOI: 10.1140/epjd/e2007-00200-0