Photodissociation and photoionization of sodium coated C<sub>60</sub> clusters. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The European Physical Journal D : Atomic, molecular, optical and plasma physics Année : 2003

Photodissociation and photoionization of sodium coated C60 clusters.

Résumé

(C60)mNan 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=1,2Nan clusters 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.

Dates et versions

hal-00142456 , version 1 (19-04-2007)

Identifiants

Citer

M. Pellarin, E. Cottancin, J. Lermé, J.L. Vialle, M. Broyer, et al.. Photodissociation and photoionization of sodium coated C60 clusters.. The European Physical Journal D : Atomic, molecular, optical and plasma physics, 2003, 25 (1), pp.31-40. ⟨10.1140/epjd/e2003-00216-4⟩. ⟨hal-00142456⟩
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