Research Papers in Physics and Astronomy


Date of this Version

May 1993


Published by American Physical Society. Copyright 1993. Permission to use. Phys. Rev. B 47 (1993) 12895–12899.


Inverse photoemission from W(110) has been used to determine the dispersion of the unoccupied energy bands along the tungsten ΓΣN line. The critical points are determined to be Γ12 at 2.6 eV, N1 at 2.2 eV, and the lower limit of N4 at 3.2 eV. The upper bound of the lifetime broadening is estimated as 0.3-0.4 eV at 2-3 eV above EF. The image state is observed at 4.5 eV above EF, or 0.7 eV in binding energy, relative to the vacuum level.

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