Adsorption of H_2 on (110), (111) and Stepped (111) Iron Single Crystal Surfaces

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The adsorption of hydrogen on Fe(110), (111) and stepped (111) surfaces has been studied using low-energy electron diffraction (LEED) and thermal desorption spectroscopy (TDS). Adsorption on the (110) surface around 300 K produces a variety of ordered LEED patterns. On the (111) surface, the LEED pattern remains unchanged with increasing exposure, whereas adsorption on the stepped (111) surface produces additional streaky spots in the direction normalto the steps. H_2 desorption spectra from the (110) and (111) surfaces have a double β-peak, whilethe spectra from the stepped (111) surface, on the other hand, have only a single β-peak whose temperature decreases with increasing exposure. The initial heats of adsorption have been calculated at 24, 20.5 and 23 kcal/mole on the (110), (111) and stepped (111) surfaces, respectively. That the fractional order spots from the (110) surface covered with hydrogen are remarkably diffuse compared with those observed at lower temperatures may be explained in terms of the repulsive interaction between adatoms occupying the nearest sites. The interaction energy has been estimated at 1-2 kcal/mole on this basis.
社団法人応用物理学会の論文
1980-10-05