Vibrations of alkali-metal atoms chemisorbed on the Al(111) surface

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

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Abstract

By use of high-resolution electron-energy-loss spectroscopy, atomic vibrations of the sodium and the lithium chemisorbed Al(111) surfaces have been investigated as a function of coverage. Owing to the screening of the adsorbate-adsorbate interaction by electrons of the Al atoms located between the alkali-metal atoms, the vibrational energy of Na on Al(111) remains almost constant (11.6-12.6 meV) over the coverage range of θ = 1 15- 1 3. The vibrational energy of Li on Al(111) also remains constant (17.6-18.1 meV) from θ = 1 30 to θ = 1, which strongly suggests a substitutional adsorption geometry for this system. Good agreement has been found between a recent ab initio calculation and the present experiment for the vibrational energy of the Al(111)(√3 × √3)R30° -Na surface.

Original languageEnglish
Pages (from-to)269-275
Number of pages7
JournalSurface Science
Volume329
Issue number3
DOIs
Publication statusPublished - 1995 May 20

Keywords

  • Adatoms
  • Alkali metals
  • Aluminum
  • Electron energy loss spectroscopy
  • Phonons

ASJC Scopus subject areas

  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

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    Nagao, T., Iizuka, Y., Umeuchi, M., Shimazaki, T., & Oshima, C. (1995). Vibrations of alkali-metal atoms chemisorbed on the Al(111) surface. Surface Science, 329(3), 269-275. https://doi.org/10.1016/0039-6028(95)00119-0