Adsorbate-induced shifts of electronic surface states: Cs on the (100) faces of tungsten, molybdenum, and tantalum

P. Soukiassian, R. Riwan, J. Lecante, E. Wimmer, S. R. Chubb, Arthur J Freeman

Research output: Contribution to journalArticle

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Abstract

The adsorption of cesium on the (100) faces of W, Mo, and Ta for coverages between 0 and 1 monolayer is studied by angle-resolved ultraviolet photoemission spectroscopy with use of synchro- tron radiation, by electron-energy-loss spectroscopy, and by low-energy electron diffraction. With increasing cesiation, the W(100) surface state at located 0.3 eV below the Fermi level is shifted by up to 1.0 eV to larger binding energies while remaining sharp and intense. A similar behavior is observed on Ta(100), whereas on Mo(100) the shift of 0.9 eV of this surface state is accompanied by a pronounced attenuation of its intensity. These experimental shifts are shown to be in excellent agreement with all-electron local-density-functional results obtained with the full-potential linearized augmented-plane-wave method for Cs monolayers on the W(100) and Mo(100) surfaces. Based on these ab initio results, the electronic origin of the shifts is understood by the formation of strongly polarized covalent bonds between the d-like surface states and the Cs 6sderived valence states. It is argued that even at high Cs coverages, the main electron-energy-loss peaks, which are observed between 1 and 2 eV, could be interpreted as Cs 6s 6plike interband transitions rather than as surface-plasmon peaks.

Original languageEnglish
Pages (from-to)4911-4923
Number of pages13
JournalPhysical Review B
Volume31
Issue number8
DOIs
Publication statusPublished - 1985

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Tantalum
Tungsten
Molybdenum
Surface states
Adsorbates
tantalum
molybdenum
tungsten
Monolayers
shift
electronics
Cesium
Covalent bonds
Electrons
Low energy electron diffraction
Electron energy loss spectroscopy
Photoelectron spectroscopy
Synchrotron radiation
Fermi level
Ultraviolet spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Adsorbate-induced shifts of electronic surface states : Cs on the (100) faces of tungsten, molybdenum, and tantalum. / Soukiassian, P.; Riwan, R.; Lecante, J.; Wimmer, E.; Chubb, S. R.; Freeman, Arthur J.

In: Physical Review B, Vol. 31, No. 8, 1985, p. 4911-4923.

Research output: Contribution to journalArticle

Soukiassian, P. ; Riwan, R. ; Lecante, J. ; Wimmer, E. ; Chubb, S. R. ; Freeman, Arthur J. / Adsorbate-induced shifts of electronic surface states : Cs on the (100) faces of tungsten, molybdenum, and tantalum. In: Physical Review B. 1985 ; Vol. 31, No. 8. pp. 4911-4923.
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