Surface-plasmon dispersion on the (100) face of aluminum
- 15 November 1975
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 12 (10), 4059-4070
- https://doi.org/10.1103/physrevb.12.4059
Abstract
Measurements of the inelastic low-energy (20 ≲ E ≲ 200 eV) electron-diffraction intensities from A1(100) are reported and analyzed to extract the dispersion relation of surface plasmons on this face of aluminum. Examination of five independent sets of experimental intensities using the two-step model of inelastic diffraction leads to the preferred results , and for the surface-plasmon dispersion and damping, respectively. Momenta are measured in and energies in eV. The analytical procedure utilized to extract surface-plasmon dispersion relations is modified, and our prior analyses for Al(111) are corrected by incorporating these modifications. Comparison of the surface-plasmon dispersion on Al(100) with that on Al(111) reveals that Al(100) is associated with a flatter dispersion and smaller damping. Within experimental error is the same for both faces. Comparison of the measured dispersion relations with calculated ones reveals the clear failure of all models based on either step-function electron densities or electrons confined by an infinite surface potential barrier. Both bulk-scattering processes and the detailed shape of the electron density profile at the surface must be incorporated into any microscopic model which is proposed for the quantitative description of the surface-plasmon dispersion relations obtained from our analyses.
Keywords
This publication has 47 references indexed in Scilit:
- Dispersion of surface plasmons and phonons in inhomogeneous mediaPhysical Review B, 1975
- Surface plasmons at the surface of liquid mercurySolid State Communications, 1974
- Sensitivity of surface plasmon dispersion and damping to alkali adsorptionSurface Science, 1973
- Sensitivity of Surface-Plasmon Dispersion and Damping to Potential Barrier ShapePhysical Review Letters, 1973
- Improved Hydrodynamic Theory of Surface PlasmonsPhysical Review B, 1973
- Variational Calculation of the Surface-Plasmon Dispersion Relation for a MetalPhysical Review Letters, 1972
- Excitation Dispersion from Inelastic Low-Energy Electron DiffractionPhysical Review B, 1970
- Influence of the Electron Charge Distribution on Surface-Plasmon DispersionPhysical Review B, 1970
- Electronic Structure of Clean Metallic InterfacesJournal of Vacuum Science and Technology, 1969
- Anisotropy of the Electronic Work Function of MetalsPhysical Review B, 1941