title: Optical absorption spectra of palladium doped gold cluster cations.
abstract: Photoabsorption spectra of gas phase Au(n)(+) and Au(n-1)Pd(+) (13 ≤ n ≤ 20) clusters were measured using mass spectrometric recording of wavelength dependent Xe messenger atom photodetachment in the 1.9-3.4 eV photon energy range. Pure cationic gold clusters consisting of 15, 17, and 20 atoms have a higher integrated optical absorption cross section than the neighboring sizes. It is shown that the total optical absorption cross section increases with size and that palladium doping strongly reduces this cross section for all investigated sizes and in particular for n = 14-17 and 20. The largest reduction of optical absorption upon Pd doping is observed for n = 15.
authors.affiliation: Laboratory of Solid State Physics and Magnetism, KU Leuven, Celestijnenlaan 200d - Box 2414, B-3001 Leuven, Belgium.
authors.forename: Vladimir E
authors.initials: VE
authors.lastname: Kaydashev
authors.affiliation: Laboratory of Solid State Physics and Magnetism, KU Leuven, Celestijnenlaan 200d - Box 2414, B-3001 Leuven, Belgium.
authors.forename: Ewald
authors.initials: E
authors.lastname: Janssens
authors.affiliation: Laboratory of Solid State Physics and Magnetism, KU Leuven, Celestijnenlaan 200d - Box 2414, B-3001 Leuven, Belgium.
authors.forename: Peter
authors.initials: P
authors.lastname: Lievens