On the structure of dense CO overlayers

Structural analysis of Pt(1 1 1)c(√3 × 5)rect.–CO using photoelectron diffraction

“…Both EELS [4,5,6,7] and RAIRS [8,9,10] measurements for CO on Pt(111) showed that for coverages up to the nominal 0.33 ML of the ordered (√3√3)R30° phase the spectra indicate pure atop site adsorption, whereas at higher coverages a mixture of atop and bridge sites are occupied. The fact that these vibrational data indicate only occupation of (approximately) high-symmetry sites led to a revised picture of the compression phases as all being locally commensurate with the intermediate average mesh sizes inferred from the LEED patterns being due to moving inter-domain boundary walls [11,12,13]. Fig.…”

From molecular interactions to gates: a systematic approach

“…Carbon monoxide (CO) molecules, placed on top of this surface, will bond to the grid points, with the carbon atoms oriented towards the surface. The interaction of CO molecules with metallic surfaces has been studied extensively, for example for Pd(110) [16], Ni(100), Pd(100), and Cu(100) [25].…”

Layer Formation on Clean Surfaces Studied by Photoelectron Spectroscopy

“…For this systems three ordered overlayer structures may be formed: p(2 √2x √2)R45°, p(3√2 x √2)R450 and p(4√2 x √2)R45° at coverages of 0.5, 0.67 and 0.75 monolayers, respectively. These overlayer structures have been studied by LEED [26,27] and electron energy loss spectroscopy [28] from which geometrical models have been proposed. In all three stuctures the CO molecules are placed in bridge sites [26,28], but the coordination number between surface Pd atoms and CO molecules changes with co verage.…”

“…These overlayer structures have been studied by LEED [26,27] and electron energy loss spectroscopy [28] from which geometrical models have been proposed. In all three stuctures the CO molecules are placed in bridge sites [26,28], but the coordination number between surface Pd atoms and CO molecules changes with co verage. Figure 9 shows the Pd 3d5 / 2 and C 1s core level spectra from the three overlayer stuctures together with a spectrum from the clean Pd surface.…”

“…In order to understand these core level binding energy shifts it is instuctive to consider the structural models [26,28] shown as insets in Fig. 10.…”