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Photoemission spectra of a 15 ML corrugated Ag film at various photon energies. Vertical green lines mark zone boundaries associated with step modulation, and the blue slanted lines correspond to a fixed emission direction along the  direction.
(a) Schematic view of the corrugated film geometry and the wave interference or propagation patterns. The inset shows the Fraunhofer single-slit diffraction pattern as a function of . The direction of the outgoing photoelectron wave is constrained to near . (b) Calculated quantum well subband dispersion relations (green curves) compared with experimental data (second derivative) taken at 22 and 78 eV.
[(a) and (b)] Photoemission spectra from a 21 ML corrugated Pb film at 21 and 50 eV. [(c) and (d)] Corresponding second derivatives of the data. Vertical green lines mark zone boundaries associated with step modulation.
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