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Field electron energy spectroscopy of alumina-supported platinum adatoms

Publication Date
  • 68.37.Vj
  • 68.47.Gh
  • 73.20.Hb
  • 73.22.-F
  • 79.70.+Q
  • 81.65.Mq


Field electron energy spectroscopy and density functional calculations have been employed to characterize electronic properties of single Pt-adatoms deposited on a thin alumina film. For Pt/Al2O3/NiAl(110) strong current enhancements were measured about 1.4 eV below the Fermi energy. No features were observed for clean Al2O3/NiAl(110) and Pt/NiAl(110) in the accessible energy range. As an explanation we propose a resonance tunneling mechanism involving an occupied electronic state of the Pt adatom close to the Fermi level.

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