Surface resonance transition of roughened Cu(1 1 0) |
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Authors: | O Zeybek AM Davarpanah SD Barrett |
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Institution: | a Department of Physics, Faculty of Science and Arts, Balikesir University, 18 km Cagis Campus, 10145 Balikesir, Turkey b Department of Physics, Sistan and Baluchestan University, Zahedan, Islamic Republic of Iran c Surface Science Research Centre, Department of Physics, University of Liverpool, Liverpool L69 3BX, UK |
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Abstract: | The temperature dependence of the reflection anisotropy spectroscopy (RAS) of a Cu(1 1 0) surface has been studied over the temperature range 700-1000 K. Because of the roughening transition at 900 K, the bimodal feature at 4.2 eV for a clean surface shifted to 4.3 eV on annealing. A significant decrease in intensity of the same energy level was also observed with increasing annealing temperature. In the annealing temperature range 700-1000 K, anharmonic behavior is expected to be the predominant process of atomic disordering at the surface. Changes in the RAS of Cu(1 1 0) as a result of thermal processing can be understood in terms of the associated changes in surface states. The RAS signal for a surface resonance transition at 4.2 eV is associated with monoatomic 0 0 1] steps. |
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Keywords: | Reflection spectroscopy Surface electronic phenomena Copper |
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