Abstract
The CO adsorption on the Pd(110)c(2 × 4)-O surface at 90 K has been investigated by using high resolution electron energy loss spectroscopy (EELS), low-energy electron diffraction (LEED), and thermal desorption spectroscopy (TDS). Three adsorbed states of CO have been found which are characterized by the CO stretch energies 235–237, 250–253 and 261–267 meV. It is proposed that CO molecules associated with these CO stretch energies are adsorbed in the “O-free” long-bridge sites, the “O-coordinated” long-bridge sites and the on-top sites of the c(2 × 4)-O structure, respectively. The CO adsorption induces the formation of a p(2 × 4) structure, which is completed by the formation of a Pd(110)p(2 × 4)-(8CO + 4O) structure at the saturation coverage ( ϑ co = 1). The structure model of the p(2 × 4)-(8CO + 4O) surface is discussed.
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