Photoemission Observation of the Formation of Pd(111) Surface States (Surface Resonances) and Resonant<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>d</mml:mi></mml:math>Levels for Pd Overlayers on Nb

Abstract

Photoemission indicates that the formation of the surface states (surface resonances) on the (111) face of ultrathin Pd overlayers on a recrystallized Nb foil commences with the deposition of the third atomic layer and is completely established at the full fourth layer. It also shows the formation of two resonant $d$ states at submonolayer coverages, corresponding to the interaction of Pd $d$ levels with the Nb bulk bands and to the Pd bulk $d$-band resonance, respectively.