He scattering study of Au(111) nanostructured by ion sputtering
| Autor: | Davide Cavanna, Gianangelo Bracco |
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| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | Journal de Physique IV (Proceedings). 132:243-247 |
| ISSN: | 1764-7177 1155-4339 |
| DOI: | 10.1051/jp4:2006132046 |
| Popis: | The morphology of the (111) surface of gold induced by ion sputtering has been investigated in the temperature range between 190 and 400 K using thermal energy He atom scattering with a beam energy around 3meV. After sputtering at grazing incidence (about 75°) along the azimuthal direction and at crystal temperature in a range 160-260 K, a well defined ripple structure with ridges oriented along the incoming ion beam direction has been observed. In fact the diffraction pattern in the same direction shows a sharp specular peak while in the 90° direction the pattern shows a specular peak with two satellites around 0.03 A -1 . The evolution with time of this structure has been followed at different crystal temperatures T c in the range 300-400K to gain information on ripple stability and on the diffusion processes contributing to ripple decay. Preliminary results show that up to 350 K the diffraction pattern does not show appreciable changes at least for 24 hours. Instead for T c ≥ 370K the intensity of satellite peaks decreases with a rate which depends on temperature. At 400K the satellite peaks disappear within 1 hour while at 370K they survive at least for 6 hours. |
| Databáze: | OpenAIRE |
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