Abstract
The inverse photoemission spectra of lead sulphide have been investigated in the energy range 15 – 33 eV of normal incidence electrons. In addition the angle-resolved photoemission spectra have been studied using synchrotron radiation. The sample crystals have been cleaved in UHV and the crystal structure has been observed by LEED to correspond the (1×1) surface geometry. The band structure to the direction Γ - X has been determined below and above the Fermi-level from the photoemission and the inverse photoemission spectra. The prominent dispersion of one occupied band is clear but the others are markedly flat. The unoccupied bands show quite well behaving dispersion. There are no bands crossing the Fermi-level in the Γ - X direction displaying the band gap 3.6 eV. General shapes of the experimental band dispersions agree satisfactorily with those predicted by theoretical calculations, but the binding energies of the bands show clearly some disagreement, especially for the lowest bands.
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