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Updated: May 27, 2026

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging
Published on: July 19, 2016
Photon energy dependent valence band response of metallic nanoparticles
K Jänkälä1, M Tchaplyguine, M-H Mikkelä
1Department of Physics, University of Oulu, PO Box 3000, 90014 Oulu, Finland. kari.jankala@oulu.fi
Abstract:
We show that the valence band response to photon impact in metallic nanoparticles is highly energy dependent. This is seen as drastic variations of cross sections in valence photoionization of free and initially charge-neutral nanosized metal clusters. The effect is demonstrated in a combined experimental and theoretical study of Rb clusters. The experimental findings are interpreted theoretically using a jellium model and superatom description. The variations are attributed to the changing overlap with the photon energy between the wave functions of diffuse delocalized valence electrons and continuum electrons producing a series of minima in the cross section.
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