Optical absorption spectra and structures of Ag6+ and Ag8+ A. Shayeghi, D. A. Götz, R. L. Johnston and R. Schäfer Eur. Phys. J. D, 69 6 (2015) 152 Published online: 09 June 2015 DOI: 10.1140/epjd/e2015-60188-2