A UPS and LEED/Auger study of adsorbates on Fe(110) |
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Authors: | G. Brodén G. Gafner H. P. Bonzel |
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Affiliation: | 1. Institut für Grenzfl?chenforschung und Vakuumphysik, Kernforschungsanlage Jülich GmbH, D-5170, Jülich, Fed. Rep. Germany
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Abstract: | Ultraviolet photoemission spectroscopy (UPS) and LEED/Auger were used to study adsorbed species of C, N, O, S, CO, NO, and C2H2 on Fe(110). The complicated “carbon ring” LEED patterns were shown to be due to atomic carbon and/or nitrogen. Molecular nitrogen does not stick at or above room temperature on Fe(110). The optical excitation probability of the 3p electrons of segregated sulphur is found to have a Cooper minimum aroundhω=40.8 eV. Carbon monoxide chemisorbs molecularly at room temperature and then dissociates slowly. Only dissociative CO adsorption was observed atT=385 K. Acetylene also adsorbs molecularly but does not dissociate at room temperature. By contrast, nitric oxide chemisorption is completely dissociative at room temperature. |
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Keywords: | 68.90+g |
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