The unoccupied states of a rare earth metal: Y(0001)
R I R Blyth; P T Andrews; S D Barrett; R I R Blyth; Surface Sci. Res. Centre, Liverpool Univ., UK; P T Andrews; Surface Sci. Res. Centre, Liverpool Univ., UK; S D Barrett; Surface Sci. Res. Centre, Liverpool Univ., UK
Журнал:
Journal of Physics: Condensed Matter
Дата:
1991-04-22
Аннотация:
Normal incidence inverse photoemission spectra of Y(0001) have been measured in the photon energy range 12-32 eV. In the photon energy range 19-23 eV fluorescence from the radiative decay of a 4p core hole largely obscures the direct transitions. Outside this range a number of features were observed, which vary in intensity but show negligible dispersion with photon energy. Their positions are in good agreement with high density-of-states points along the Gamma A direction of published bandstructure calculations. A feature is observed 0.5 (+or-0.2) eV above the Fermi level, in the gap between the Gamma <sub>4-</sub> and Gamma <sub>3+</sub> critical points, which may be due to either a surface state or to the high overall density of states at the Fermi level.
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