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Dynamical Response of an Overlayer of Alkali-Metal Atoms Adsorbed on a Free-Electron Metal Surface

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Surface Science

Part of the book series: Springer Proceedings in Physics ((SPPHY,volume 62))

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Abstract

We report a theoretical study of the spectrum of elementary excitations of an alkali-atom overlayer adsorbed on Al. This study is placed in the context of recent experiments via the evaluation of the loss-spectrum for near-specular electron backscattering, starting from the knowledge of the dynamical density-response function for an electron-gas model of the chemisorption interface. Detailed results are presented for the case of Na overlayers. For coverage < one monolayer the calculated loss spectrum shows the presence of a peak due to incoherent electron-hole pair excitation, combined with the kinematic factor which enters the scattering probability. For coverage > one monolayer the loss spectrum corresponds to plasmon-like excitation. For two-monolayer coverage an additional overlayer-induced collective loss is found. For thick Na overlayers this mode corresponds to the “dipole” surface plasmon long-predicted theoretically, and recently discovered experimentally. The transition from quasi two-dimensional response to three-dimensional response must be studied microscopically: macroscopic-response theory fails qualitatively for monolayer coverage.

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Authors and Affiliations

  1. Department of Physics, Montana State University, Bozeman, MT, 59717, USA

    A. G. Eguiluz & J. A. Gaspar

Authors
  1. A. G. Eguiluz
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  2. J. A. Gaspar
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Editor information

Editors and Affiliations

  1. Xerox Corp., Palo Alto Research Center, 3333 Coyote Hill Road, 94304, Palo Alto, CA, USA

    Fernando A. Ponce

  2. Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, W-7000, Stuttgart 80, Fed. Rep. of Germany

    Manuel Cardona

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© 1992 Springer-Verlag Berlin Heidelberg

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Eguiluz, A.G., Gaspar, J.A. (1992). Dynamical Response of an Overlayer of Alkali-Metal Atoms Adsorbed on a Free-Electron Metal Surface. In: Ponce, F.A., Cardona, M. (eds) Surface Science. Springer Proceedings in Physics, vol 62. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-76376-2_4

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  • DOI: https://doi.org/10.1007/978-3-642-76376-2_4

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-76378-6

  • Online ISBN: 978-3-642-76376-2

  • eBook Packages: Springer Book Archive

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