Image-Potential States Observed by Inverse Photoemission
- 21 May 1984
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 52 (21), 1919-1921
- https://doi.org/10.1103/physrevlett.52.1919
Abstract
Momentum-resolved photoemission spectra from Cu(100) exhibit structure at 4 eV above the Fermi energy in a bulk band gap. This emission is pinned to the vacuum level and shows a free-electron-like dispersion. It is polarized with electric vector normal to the surface. The emission intensity is independent of the sample temperature unlike that of a simultaneously observed bulk direct transition. These properties identify the observed phenomenon as transitions into image-potential surface states.Keywords
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