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

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Abstract.

(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.

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Authors and Affiliations

  1. Laboratoire de Spectrométrie Ionique et Moléculaire (UMR 5579 du CNRS), 43 boulevard du 11 novembre 1918, 69622, Villeurbanne Cedex, France

    M. Pellarin, E. Cottancin, J. Lermé, J.L. Vialle & M. Broyer

  2. Laboratoire de Physique de la Matiére Condensée et Nanostructures (UMR 5586 du CNRS), 43 boulevard du 11 novembre 1918, 69622, Villeurbanne Cedex, France

    F. Tournus, B. Masenelli & P. Mélinon

Authors
  1. M. Pellarin
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  2. E. Cottancin
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  3. J. Lermé
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  4. J.L. Vialle
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  5. M. Broyer
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  6. F. Tournus
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  7. B. Masenelli
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  8. P. Mélinon
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Correspondence to M. Pellarin.

Additional information

Received: 7 May 2003, Published online: 17 July 2003

PACS:

36.40.Qv Stability and fragmentation of clusters - 36.40.Mr Spectroscopy and geometrical structure of clusters

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Pellarin, M., Cottancin, E., Lermé, J. et al. Photodissociation and photoionization of sodium coated C \(_\mathsf{60}\) clusters. Eur. Phys. J. D 25, 31–40 (2003). https://doi.org/10.1140/epjd/e2003-00216-4

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  • DOI: https://doi.org/10.1140/epjd/e2003-00216-4

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