A quantum-well state at the Pd(110) surface

Abstract

Energy versus momentum dispersion relations of Pd(110) along - K - X symmetry lines have been studied using angle-resolved photoemission spectroscopy with synchrotron radiation. We have observed a peak near the Fermi level over the photon energy range of 17 - 80 eV. We present conclusive data that this peak is a quantum-well state, on this metallic surface, due to the difference in the potential barriers of the surface and bulk. This peak exhibits resonance in intensity with the photon energy, which is well explained by the surface quantum-well model. This is the first observation of electron confinement at the surface of a simple metal.

Acceleration of hydrogen absorption by palladium through surface alloying with gold

“…The band shows a nearly flat feature near k y = 0 and bends downward at k y > 0.4 Å −1 . This band corresponds to the surface state or the quantum well state of Pd(110) as reported previously ( 20 – 23 ). An additional feature around 2–3 eV appears at k y > 0.6 Å −1 .…”

Quantum-well states in Cu/Fe/Cu(111) coupled to the bulk band through the barrier

“…If a QWS exists in this system, the intensity of this QWS is also expected to change. The origin of this oscillation could be either interference between the surface and interface coherent photoelectrons as found in Ag/V(001) [4] and Pd(110) [17] or the vertical transition from QWS to the unoccupied bulk band, as in Cu/Co(100) [18]. If the overlayer Cu is too thin to generate the bulk band, then this second scenario will not be possible.…”