The adsorption of xenon on hydrogen modified Pt(110)-(1 2) and on Pt(997) has been studied using TPD, LEED, XPS, and ARUPS. On Pt(110)-(1 2) with preadsorbed hydrogen, a single xenon species forming one-dimensional adsorbate chains in the [110] direction is found. ARUPS shows well-resolved dispersion of the xenon 5p 1 2 and the split 5p 3 2 bands in the [110] azimuth, but no dispersion in the [001] direction, in agreement with the packing density. On Pt(997) xenon decorates the close-packed steps in [110] direction at low coverages. No dispersion of xenon bands is seen in ARUPS, indicating weak lateral adsorbate interaction along the chains as expected from the relatively large Xe-Xe distance of 5.6 9 extracted from LEED.