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Surface Core Level Shifts for the Clean-Surface and Hydrogen-Induced Phase Transitions on W(l00)

  • J. Jupille
  • K. G. Purcell
  • G. Derby
  • J. Wendelken
  • D. A. King
Conference paper
Part of the Springer Series in Surface Sciences book series (SSSUR, volume 11)

Abstract

The well-known phase transition on W (100)occurs over a narrow temperature range on ‘flat’ single crystals, cut to within 0.1o. Surface core level shift spectra (W 4f 7/2) are reported here for the clean surface phase transition and also for the hydrogen-induced phase transition on such a flat W{100}crystal. Changes through the clean surface phase transition reveal only a subtle difference in the spectra, attributable to a shift in the core level peak associated with the surface layer of only 15 meV. However, hydrogen adsorption at room temperature produces a dramatic change in the spectra. The centre-of gravity of the W 4f 7/2 band shifts by 160 meV as the c(2×2) phase is formed, with a return towards the clean surface value as the 2-monolayer (1×1) phase is formed. The clean surface data are readily interpreted with the Debe-King model for the low temperature structure, but there are interesting differences between stepped and flat surfaces. Analysis of the data from the hydrogen-covered surface proved to be less straight forward.

Keywords

Tungsten 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • J. Jupille
    • 1
  • K. G. Purcell
    • 1
  • G. Derby
    • 1
  • J. Wendelken
    • 2
  • D. A. King
    • 1
  1. 1.The Donnan LaboratoriesThe University of LiverpoolLiverpoolUK
  2. 2.Solid State DivisionOak Ridge National LaboratoryOak RidgeUSA

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