Spectroscopy of isolated, mass-selected tryptophan-Ag3 complexes: a model for photoabsorption enhancement in nanoparticle-biomolecule hybrid systems.

摘要: We wish to show that gas-phase studies of small metal cluster-biomolecule complexes provide fundamental insights into the mechanism leading enhanced optical absorption in nanoparticle-biomolecular hybrid systems. Here we present, for first time, a joint experimental and theoretical study photoabsorption photofragmentation silver trimer-tryptophan cation complex ([Trp∙Ag3]+). demonstrate binding cluster biomolecule leads remarkably high as compared bare tryptophan or [Trp∙Ag]+ complex. As calculations this arises due coupling between excitations metallic subunit with charge transfer excitation molecule.