Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.236801
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Funding
- Deutsche Forschungsgemeinschaft [GK 790]
- Ikerbasque Foundation
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Image-potential states have been studied by two-photon photoemission for the surface of Al(100) where the whole series is energetically degenerate with free-electron-like bulk states. In contrast with expectations, the series of resonances is not smeared out to one broad structure as a result of a strong coupling to the bulk continuum. Instead, the first resonance (n = 1) is found to be suppressed, and the resonances with quantum numbers n = 2; 3; 4; 5 are resolved as individual peaks in the time-resolved spectra. Both effects are suggested to be a consequence of resonance trapping.
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