W. Widdra, Electronic band structures of low-dimensional adsorbate systems: Rare-gas adsorption on transition metals, APPL PHYS A, 72(4), 2001, pp. 395-404
Angle-resolved photoemission data are discussed for five different Xe adlay
ers which exhibit electronic structures of different dimensionalities. Xe a
dsorption on Ni(110)-(1 x 2)-3H and the (root3 x root3) R30 degrees Xe laye
r on Ru (001) reveal two-dimensional (2D) Xe-derived band structures that a
re characteristic for hexagonal rare-gas layers. Different Xe 5p dispersion
widths on Ni and on Ru are found due to the difference in the Xe-Xe neares
t-neighbor distance. For three rare-gas systems (two different Xe coverages
on hydrogen-modified Pt(110)-(1 x 2)-H and Kr step decoration on a Pt(997)
surface) true one-dimensional (1D) band structures are found. For Xe step
adsorption on Pt (997), electronic localized (OD) behavior is observed due
to an enlarged Xe-Xe separation. The qualitative differences of the band st
ructures in the case of 2D, 1D and OD rare-gas systems are demonstrated and
are explained by the different dimensionalities of the various structures.