Abstract
The adsorption of iodine on the (111) face of a gold single crystal has been studied using Auger Electron Spectroscopy and LEED. The adsorption reaction produced three new LEED patterns; the ( 3 × 3 )R30° and two higher coverage patterns where the fractional order diffraction features split into three and then into six features. The corresponding surface coverages ranged from a third monolayer for the ( 3 × 3 )R30° pattern to an approximately half monolayer coverage for the intermediate pattern. The highest coverage structure was observed only with an over-pressure of iodine and reverted to the intermediate structure at lower pressures.
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