Surface phonon dispersion on Al(100)

Abstract
The first experimental measurement of the Rayleigh mode dispersion curve for the Al(100) surface is reported. Excellent agreement is found between the experimental results and the theoretical first-principles calculation performed by Bohnen and Ho [J. Vac. Sci. Technol. A5, 462 (1987)] for the phonon energy at . This is to be contrasted with the large discrepancy reported by Toennies and Wöll [Phys. Rev. B 36, 4475 (1987)] between the experimental and theoretical values at for the Al(110) surface.