Abstract
We have characterised the low temperature adsorption of ethene on both clean and chlorine-precovered Ag(100) surfaces. On the clean surface at temperatures ca. 100 K ethene is found to be weakly π-bonded at all coverages with dynamic pressures of the gas being required to saturate the monolayer adsorption state. At high coverages, around the monolayer point, repulsive adsorbate-adsorbate interactions induce a reorientation of the ethene which rotates the molecular plane towards the surface normal. The interaction of ethene with a surface pretreated with Cl 2 is strongly dependent on the Cl coverage. At low values an enhancement of the ethene-surface interaction via the formation of ordered ethene-chlorine structures is observed, although no substantial re-hybridisation of the ethene is induced, while at high Cl coverage a progressive passivation of the surface is produced. The results presented are consistent with the formation of a simple chemisorbed layer of chlorine.
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