Elsevier

Applications of Surface Science

Volume 6, Issues 3–4, November–December 1980, Pages 288-296
Applications of Surface Science

Investigation of surface reactions by SIMS and TDMS: Interaction of ethylene and acetylene with hydrogen on polycrystalline nickel

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Abstract

Secondary ion mass spectrometry (SIMS) and thermal desorption mass spectrometry (TDMS) have been applied to study the interaction of ethylene and acetylene with a polycrystalline nickel surface as well as the interaction of hydrogen and ethylene on nickel. Due to relationships between certain surface complexes and their corresponding secondary ion emission, which had been established in a series of previous experiments, a number of adsorption products could be identified. For ethylene as well as acetylene the first step of room temperature adsorption was characterized by complete decomposition of the incoming molecules and the formation of nickel-carbon and nickel-hydrogen complexes. In a final step, we observed undissociated adsorption of ethylene and acetylene molecules, respectively. In the intermediate stage of ethylene adsorption, an acetylene species was identified. Other types of hydrocarbon residues may be indicated by the emission of secondary ions like CmH±n. Dissociation of the hydrocarbon species is observed if a surface, exposed to acetylene or ethylene at 80 K is heated. Thermal desorption of a fraction of the adsorbed C2H4/C2H2 molecules occurs prior to dissociation. Ethylene exposure of a hydrogen covered surface at 80 K results in the displacement of nickel bonded hydrogen, while hydrogen exposure of a nickel-carbide layer at 80 K leads to enhancement of some ion species of the general composition CmH±n.

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