Water monolayer and multilayer adsorption on Ni(1 1 1) |
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Authors: | M.E. Gallagher S. Haq A. Omer A. Hodgson |
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Affiliation: | Surface Science Research Centre, The University of Liverpool, Liverpool L69 3BX, United Kingdom |
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Abstract: | Water adsorbed on Ni(1 1 1) forms an ordered, hydrogen bonded ice structure with a (2√7 × 2√7)R19° unit cell. The 2√7 wetting structure forms as islands and persists up to saturation of the first layer. Adsorption of a fraction of a monolayer more water into a second layer destroys the 2√7 registry and creates a disordered ice film. Gas adsorption measurements indicate that the wetting layer is completely covered by a second layer of water before thicker multilayer ice forms. As the second layer is completed the film orders to form an incommensurate crystalline ice film with a hexagonal LEED pattern, oriented to the Ni close packed rows. This ordered, incommensurate structure persists as the ice multilayer grows thicker. |
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Keywords: | Water Adsorption Ni(1 1 1) Surface Low energy electron diffraction (LEED) |
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