Optical absorption of isolated silver cluster-tryptophan: A joint experimental and theoretical studyT. Tabarin, R. Antoine, I. Compagnon, M. Broyer, P. Dugourd, R. Mitrić, J. Petersen and V. Bonačić-KouteckýEur. Phys. J. D, 43 1-3 (2007) 275-278DOI: https://doi.org/10.1140/epjd/e2007-00118-5