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Sökning: WFRF:(Uhrberg R. I. G.)

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1.
  • Le Lay, G., et al. (författare)
  • STM and synchrotron radiation studies of "prototypical" metal{plus 45 degree rule}semiconductor systems
  • 1994
  • Ingår i: Surface Science. - 0039-6028. ; 307-309:PART A, s. 280-294
  • Tidskriftsartikel (refereegranskat)abstract
    • Since the origin of surface science noble metal{plus 45 degree rule}elemental semiconductor couples have been considered as "prototypical" systems. After three decades of research their structural and electronic properties remain an intriguing maze despite recent advances made, especially thanks to the development of the near-field microscopies and the extensive use of synchrotron radiation in surface crystallography and in high-resolution photoelectron spectroscopy. In the last few years, lead, as a replacement inert metal, has nearly gained the pole position in the display of exotic behaviour. This paper gives a flavour of this mystery story and highlights some puzzling questions. © 1994.
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2.
  • Uhrberg, R I G, et al. (författare)
  • Well-Known "Surface State" on Si(111)2×1 Identified as a Bulk Contribution
  • 1984
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 52:25, s. 2265-2268
  • Tidskriftsartikel (refereegranskat)abstract
    • Using polarization-dependent angle-resolved photoemission we show that two dominating structures in the photoemission spectra are due to direct transitions from the uppermost two valence bands in silicon. The final-state band for these transitions at photon energies 10.2-21.2 eV is found to have free-electron-like dispersion. Our results imply that that threefold-symmetry emission often assigned to back-bond surface states on Si(111)2×1 is really due to bulk photoemission.
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