@inbook{744,
  abstract     = {{Silver cluster ions are produced by sputtering of solid silver by 25 keV Xe+ bombardment. After mass selection, collinear ion beam depletion technique is used to measure absolute photofragmentation cross-sections in the photon energy range from ħω = 2.3 to 5.7 eV. Giant resonances are found which can be interpreted in terms of a collective electron oscillation. The optical spectra of spherical Ag 9 + and Ag 21 + show a blue shift of the resonance energy, in contrast to an expected behaviour within the jellium model. For Ag 11 +, a splitting of the giant resonance is found.}},
  author       = {{Tiggesbäumker, J. and Köller, Lars and O. Lutz, H. and Meiwes-Broer, Karl-Heinz}},
  booktitle    = {{Physics and Chemistry of Finite Systems: From Clusters to Crystals}},
  editor       = {{Jena, P. and N. Khanna, S. and K. Rao, B.}},
  isbn         = {{978-94-017-2647-4}},
  keywords     = {{Oscillator Strength, Collective Excitation, Giant Dipole Resonance, Silver Cluster, Gigant Resonance}},
  pages        = {{1001--1006}},
  publisher    = {{Springer}},
  title        = {{{Collective Excitation in Silver Cluster Ions}}},
  doi          = {{https://doi.org/10.1007/978-94-017-2645-0_135}},
  volume       = {{374}},
  year         = {{1992}},
}

@inbook{745,
  abstract     = {{Positive and negative silver cluster ions are produced by sputtering of solid silver by 25 keV Xe+ bombaxdment. After mass selection, collinear ion beam depletion is used to measure absolute photofragmentation cross-sections in the photon energy range from ħω = 2.0 to 5.7 eV. Giant resonances are found which can be interpreted in terms of a collective electron oscillation. For spherical clusters (e.g., Ag19−, Ag21+) single resonances dominate the spectra, whereas deformation (e.g., Ag9−, Ag11+) induces a splitting into two components.}},
  author       = {{Tiggesbäumker, J. and Köller, Lars and O. Lutz, H. and Meiwes-Broer, Karl-Heinz}},
  booktitle    = {{Nuclear Concepts in Atomic Cluster Physics}},
  editor       = {{Schmidt, Rüdiger}},
  isbn         = {{978-3-540-55625-1}},
  location     = {{Bad Honnef}},
  pages        = {{245--253}},
  publisher    = {{Springer}},
  title        = {{{Collective Excitation in Silver Cluster Anions and Kations}}},
  doi          = {{https://doi.org/10.1007/3-540-55625-7_27}},
  volume       = {{404}},
  year         = {{1992}},
}