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Phys. Rev. A 48, R1749 - R1752 (1993)

Blue shift of the Mie plasma frequency in Ag clusters and particles

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Josef Tiggesbäumker and Lars Köller
Fakultät für Physik, Universität Bielefeld, 33501 Bielefeld 1, Federal Republic of Germany

Karl-Heinz Meiwes-Broer
Fakultät für Physik, Universität Bielefeld, 33501 Bielefeld 1, Federal Republic of Germany
Fachbereich Physik, Universität Rostock, 18051 Rostock, Federal Republic of Germany

Ansgar Liebsch
Institut für Festkörperforschung, Forschungszentrum, 52425 Jülich, Federal Republic of Germany

Rapid Communication Received 20 January 1993

Photodepletion spectroscopy is used to measure the optical activity of sputtered Ag ionic clusters with up to 70 atoms. With decreasing cluster size the giant resonance caused by collective excitation of the valence electrons shifts to higher frequencies. This blue shift is qualitatively explained in terms of a reduced s-d screening interaction in the surface region of the particles.


©1993 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.48.R1749
DOI: 10.1103/PhysRevA.48.R1749
PACS: 36.40.+d, 78.20.-e, 33.80.Gj, 21.60.Ev

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