Abstract
We present high-resolution inverse-photoemission spectra for the clean Pd(111) surface. For what we believe to be the first time we clearly resolve the anticipated Shockley state at the bottom of the band gap. This state is found to have a binding energy of 1.3 eV above the Fermi level and an effective mass of approximately 0.3. We further observe the n=1 image state and find that it has a binding energy of 0.5 eV with respect to the vacuum level and an effective mass of 1.0. Comparison with the phase model shows good agreement with these measured binding energies. We find that these measurements indicate that the image plane is close to the jellium edge.
- Received 25 April 1986
DOI:https://doi.org/10.1103/PhysRevB.34.3670
©1986 American Physical Society