Strong vibrational mode signatures in surface alloys

A. Khater, H. Grimech, J. Lapujoulade, F. Fabre

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A formalism for calculating the surface phonon dispersion curves in surface alloys, is presented, using the matching technique and an effective field approach that goes beyond the virtual crystal approximation. Numerical results are exemplified for the [010] direction in the PtcCu1 - c first layer alloy on a Cu(001) substrate, for random and Ising correlated distributions of Pt and Cu atoms. For different Pt concentrations, the surface alloy is characterized strongly by different mode signatures in the window of the projected bulk phonon distribution on the Cu(001) surface, at energies of ~ 20 meV. The initial Rayleigh mode shifts are significant, and another Rayleigh mode appears, with increasing Pt concentrations. This second mode distinguishes between random and correlated distributions within instrument resolution of He scattering and EELS.

Original languageEnglish
Pages (from-to)381-382
Number of pages2
JournalSurface Science
Volume251-252
Issue numberC
DOIs
Publication statusPublished - 1 Jul 1991
Externally publishedYes

Fingerprint

vibration mode
signatures
Electron energy loss spectroscopy
statistical distributions
Scattering
formalism
Atoms
Crystals
shift
Substrates
curves
approximation
scattering
crystals
atoms
energy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Khater, A., Grimech, H., Lapujoulade, J., & Fabre, F. (1991). Strong vibrational mode signatures in surface alloys. Surface Science, 251-252(C), 381-382. https://doi.org/10.1016/0039-6028(91)91019-T

Strong vibrational mode signatures in surface alloys. / Khater, A.; Grimech, H.; Lapujoulade, J.; Fabre, F.

In: Surface Science, Vol. 251-252, No. C, 01.07.1991, p. 381-382.

Research output: Contribution to journalArticle

Khater, A, Grimech, H, Lapujoulade, J & Fabre, F 1991, 'Strong vibrational mode signatures in surface alloys', Surface Science, vol. 251-252, no. C, pp. 381-382. https://doi.org/10.1016/0039-6028(91)91019-T
Khater A, Grimech H, Lapujoulade J, Fabre F. Strong vibrational mode signatures in surface alloys. Surface Science. 1991 Jul 1;251-252(C):381-382. https://doi.org/10.1016/0039-6028(91)91019-T
Khater, A. ; Grimech, H. ; Lapujoulade, J. ; Fabre, F. / Strong vibrational mode signatures in surface alloys. In: Surface Science. 1991 ; Vol. 251-252, No. C. pp. 381-382.
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