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Transition of the electronic response from molecular-like to jellium-like in cold, small sodium clusters

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Zeitschrift für Physik D Atoms, Molecules and Clusters

Abstract

Absolute photoabsorption cross sections for Na + n (2≤n≤21) were measured in the visible energy range. The cluster ions were produced in a gas aggregation source and thus have a canonical distribution of internal energy corresponding to a temperature of ∼ 105 K. The spectra for n≤9 and 11 exhibit between two and six absorption lines, and are in qualitative agreement with ab inito quantum chemical calculations. For n=15 and 21, the position of the resonances can be explained as excitations of a nearly free electron gas in a spheroidal container. An evolution is thus observed from molecular-like transitions to a giant collective resonance of the electron cloud. The integrated oscillator strength is 0.95 per 3s-electron in the energy range covered for n≥4, showing that the main excitations of the valence electrons have been found.

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Author notes

  1. Christoph Ellert

    Present address: Steacie Institute for Molecular Sciences, National Research Council of Canada, Bldg M23A, Montreal Road, Ottawa, K1A 0R6, Ontario, Canada

Authors and Affiliations

  1. Fakultät für Physik, Universität Freiburg, H.Herderstasse 3, Freiburg, D-79104, Germany

    Christoph Ellert, Martin Schmidt, Thomas Reiners & Hellmut Haberland

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  1. Christoph Ellert
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  2. Martin Schmidt
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  3. Thomas Reiners
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  4. Hellmut Haberland
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Ellert, C., Schmidt, M., Reiners, T. et al. Transition of the electronic response from molecular-like to jellium-like in cold, small sodium clusters. Z Phys D - Atoms, Molecules and Clusters 39, 317–323 (1997). https://doi.org/10.1007/s004600050142

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  • DOI: https://doi.org/10.1007/s004600050142

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