Photoabsorption spectra of sodium clusters

  • Absolute photoabsorption cross sections of free neutral sodium clusters containing from N=3 to 40 atoms are presented. Investigation of a wide continuous range of cluster sizes reveals the size development of the photoabsorption behavior. In the smallest clusters the absorption is moleculelike. A transition to collective electronic excitations (surface plasmons) occurs in the size range of N=3 to 5. For clusters with N=6 to 12 atoms the surface plasma resonances are particularly well defined,Absolute photoabsorption cross sections of free neutral sodium clusters containing from N=3 to 40 atoms are presented. Investigation of a wide continuous range of cluster sizes reveals the size development of the photoabsorption behavior. In the smallest clusters the absorption is moleculelike. A transition to collective electronic excitations (surface plasmons) occurs in the size range of N=3 to 5. For clusters with N=6 to 12 atoms the surface plasma resonances are particularly well defined, and their positions are consistent with the predictions of an ellipsoidal shell model. The cluster shapes can be deduced from the observed resonance positions; the data provide a sensitive measurement of the relative axis lengths of ellipsoidal clusters. For clusters containing N≳3 atoms, the plasma resonances do not always coincide with the positions predicted by the ellipsoidal shell model. In addition to these resonances, which dominate the spectra, there are three distinct wavelength regions within which absorption occurs for all investigated clusters. © 1991 The American Physical Societyshow moreshow less

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Metadaten
Author:Kathy Selby, Vitaly Kresin, Jun Masui, Michael Vollmer, Walt A. de Heer, Adi Scheidemann, W. D. Knight
DOI:https://doi.org/10.1103/PhysRevB.43.4565
Parent Title (English):In: Physical Review / B Vol. 43 (1991) 6,, 4565–4572
Document Type:Article
Language:English
Year of Publishing:1991
Date of Publication (online):2014/01/10
Release Date:2014/01/10
First Page:4565
Last Page:4572
University Bibliography:Hochschulbibliographie
Licence (German):Creative Commons - Namensnennung, Nicht kommerziell, Keine Bearbeitung