Surface phonons of Na-induced superstructures on Al(111)

T. Nagao, Y. Iizuka, T. Shimazaki, C. Oshima

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We report the surface phonon measurement by high-resolution electron-energy-loss spectroscopy of the Na-induced superstructures on Al(111). Semiempirical simple lattice dynamical analysis using several central forces is applied to understand qualitatively the vibrational properties of the system as a first step. The lattice dynamical calculation for the Al(111)-(√3x √3)R30°-Na surface with a substitutional adsorption geometry reproduces the observed strongly dispersing surface resonant mode, while the calculated dispersion curves for a threefold adsorption geometry differ largely from the observed ones. This is explained in terms of the structural difference which causes different restoring forces at Na atoms. The observed dipole active surface resonant mode at the Γ̄ point is assigned to a perpendicular motion of Na against the almost fixed substrate which is similar to the one of which frequency was determined by some ab initio calculations. For the Al(111)-(2X2)-Na surface, the measured surface phonon dispersion curves locate very close to Rayleigh mode of the clean Al(111) and its backfold at M̄′ point.

Original languageEnglish
Pages (from-to)10064-10073
Number of pages10
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume55
Issue number15
Publication statusPublished - 1997 Apr 15

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Phonons
phonons
Adsorption
adsorption
Geometry
Electron energy loss spectroscopy
dispersing
curves
geometry
energy dissipation
electron energy
dipoles
Atoms
causes
high resolution
Substrates
spectroscopy
atoms

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Nagao, T., Iizuka, Y., Shimazaki, T., & Oshima, C. (1997). Surface phonons of Na-induced superstructures on Al(111). Physical Review B - Condensed Matter and Materials Physics, 55(15), 10064-10073.

Surface phonons of Na-induced superstructures on Al(111). / Nagao, T.; Iizuka, Y.; Shimazaki, T.; Oshima, C.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 55, No. 15, 15.04.1997, p. 10064-10073.

Research output: Contribution to journalArticle

Nagao, T, Iizuka, Y, Shimazaki, T & Oshima, C 1997, 'Surface phonons of Na-induced superstructures on Al(111)', Physical Review B - Condensed Matter and Materials Physics, vol. 55, no. 15, pp. 10064-10073.
Nagao T, Iizuka Y, Shimazaki T, Oshima C. Surface phonons of Na-induced superstructures on Al(111). Physical Review B - Condensed Matter and Materials Physics. 1997 Apr 15;55(15):10064-10073.
Nagao, T. ; Iizuka, Y. ; Shimazaki, T. ; Oshima, C. / Surface phonons of Na-induced superstructures on Al(111). In: Physical Review B - Condensed Matter and Materials Physics. 1997 ; Vol. 55, No. 15. pp. 10064-10073.
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