Abstract
Abstract The Pd(100)/H/CO coadsorption system has been studied for different H 2 and CO doses and substrate temperatures using electron energy loss spectroscopy (EELS), low-energy electron diffraction (LEED), and thermal desorption spectroscopy (TDS). For 2 L CO on a Pd(100)p(1 × 1)H surface a well-defined (2√2 × 2√2)R45° LEED pattern develops when the temperature is increased from the initial 80 to 200 K. The CO molecules adsorb in bridge sites, exhibiting the same PdCO and CO vibrational frequencies as on the clean surface, while the hydrogen adlayer shows a new vibrational mode at 56 meV associated with atoms in modified hollow sites. Annealing at higher temperatures causes the appearance of a (2√2 × √2)R45° structure. For larger CO doses a (3√2 × √2)R45° structure forms. Our observations indicate that the (2√2 × 2√2)R45°structure and the 56 MeV loss are related to a surface complex containing an intermediate state preceding the dissolution of hydrogen.
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