Characterization of K and Cs adsorption on Fe(110)
| Autor: | E. Reinhart, D. Borgmann, Th. Seyller, Gerd Wedler, R. Haseneder |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Auger electron spectroscopy
Chemistry Analytical chemistry Surfaces and Interfaces Condensed Matter Physics Surfaces Coatings and Films Adsorption X-ray photoelectron spectroscopy Electron diffraction Monolayer Materials Chemistry Saturation (chemistry) Surface states Ultraviolet photoelectron spectroscopy |
| Zdroj: | Surface Science. 424:278-289 |
| ISSN: | 0039-6028 |
| Popis: | The adsorption of K and Cs on Fe(110) has been studied by low-energy electron diffraction (LEED), Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). At room temperature, no ordered structures were observed until the saturation coverage was reached. At 90 K, the formation of ordered structures takes place above Θ =0.20. The structures are hexagonal with varying density, but alignment with respect to the substrate changes between Θ =0.23 and 0.25. At saturation of the first monolayer, the K–K and Cs–Cs nearest-neighbor distances are compressed with respect to the bulk values. From the photoemission data, the onset of metallization of the Cs layers can be detected at a coverage of about 30% of the saturation coverage. For Cs, a second layer with a relaxed nearest neighbor distance was observed. From the Cs 4d intensity vs. coverage curve, a layer-by-layer growth mode can be derived. |
| Databáze: | OpenAIRE |
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