Abstract
The dynamical response of the electrons at or near a surface is intimately related to many of the chemical and physical properties of a surface. We have used various electron and photon spectroscopies to probe the dynamical response of the electrons in nearly free electron (NFE) metals. The NFE metals can be treated theoretically using interacting electron gas theories, so the experimental data can be used to evaluate various theoretical approximations. Existing theories were first tested in the bulk where the charge density gradient existing at or near the surface is not important. Experimental data for the quasiparticle band structure of Na (obtained from angle resolved photoemission) compared to theoretical calculations clearly indicate that the response of an electron gas must be treated beyond RPA type approximations. At the surface the wavelength and penetration depth of the longitudinal density waves created in response to an external field have been measured as a function of frequency using Second Harmonic Generation. The characteristics of these longitudinal fields do not agree with existing RPA type calculations. Finally we have measured the surface plasmon dispersion using inelastic electron scattering, and compared the measurements to developing theories.
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Plummer, E.W., Lyo, IW., Song, KJ., Tsuei, KD. (1988). Dynamical Response of a Metal Surface. In: de Wette, F.W. (eds) Solvay Conference on Surface Science. Springer Series in Surface Sciences, vol 14. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74218-7_38
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DOI: https://doi.org/10.1007/978-3-642-74218-7_38
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