Research Papers in Physics and Astronomy


Date of this Version

October 1984


Published by American Physical Society. Copyright 1984. Permission to use. Phys. Rev. Lett. 53 (1984) 1493–1496.


New features are observed in normal-emission photoelectron spectra from Ni(100) in a narrow range of photon energies around 25 eV. These features are inconsistent with either direct transitions from the bulk or emission from occupied surface states or resonances. We suggest that they are a consequence of interference between the ordinary direct transition emitting an electron in the normal direction and the excitation from the same initial state into a final state that would normally be emitted from the surface at Γ― in the second surface Brillouin zone, but at this energy is trapped in a surface wave.

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