Abstract
The two closely situated electronic bands for the 〈111〉 tungsten direction between the Fermi level and the vacuum level have been observed using photofield emission spectroscopy and s-polarized light in the visible range. Measurements with p-polarized light reveal surface states below the Fermi level. Optical transitions have been found from the shoulders of the photocurrent characteristics. The observed excitations are in good agreement with the bulk band structure and the surface density of states of tungsten calculated by theory.
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