Photodissociation and photoionization of sodium coated C \(_\mathsf{60}\) clusters

  • M. PellarinEmail author
  • E. Cottancin
  • J. Lermé
  • J.L. Vialle
  • M. Broyer
  • F. Tournus
  • B. Masenelli
  • P. Mélinon
Original Paper


(C60) m Na n clusters are produced in a tandem laser vaporization source and analyzed by photoionization and photofragmentation time-of-flight mass spectroscopy. At low sodium coverage, the special behavior of (C60)m=1,2Na n clusters \((n\leq 6m)\) is consistent with a significant electron transfer from the first six adsorbed atoms towards each of the C60 fullerenes and an ionic-like bonding in this size range. However, the stability of the (C60)Na3+ cation is found much more pronounced than the one of (C60)Na7+ predicted to be a magic size under the hypothesis of a full charge transfer from the metal atoms to the C60 molecule. When more sodium atoms are present, metal-metal bonds tend to become preponderant and control the cluster properties. Relative to the number of sodium atoms, an odd-even alternation in their stability is explained by the high dissociation rates for even-numbered clusters. The even clusters evaporate neutral sodium atoms whereas odd ones prefer to evaporate Na2 molecules. The hypotheses for the growth of a sodium droplet that does not wet the fullerene surface or for the formation of a concentric metallic layer are discussed in the light of this study.


Fullerene Sodium Atom Full Charge Neutral Sodium High Dissociation Rate 
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Copyright information

© Springer-Verlag Berlin/Heidelberg 2003

Authors and Affiliations

  • M. Pellarin
    • 1
    Email author
  • E. Cottancin
    • 1
  • J. Lermé
    • 1
  • J.L. Vialle
    • 1
  • M. Broyer
    • 1
  • F. Tournus
    • 2
  • B. Masenelli
    • 2
  • P. Mélinon
    • 2
  1. 1.Laboratoire de Spectrométrie Ionique et Moléculaire (UMR 5579 du CNRS)Villeurbanne CedexFrance
  2. 2.Laboratoire de Physique de la Matiére Condensée et Nanostructures (UMR 5586 du CNRS)Villeurbanne CedexFrance

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