Structure and properties of samarium overlayer and Sm/Rh surface alloy on Rh(100) |
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| Authors: | Ma Yunsheng Zhu Junfa Zhou Weiping Zhai Runsheng Bao Xinhe Zhang Xingyi Zhuang Shuxian |
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| Affiliation: | (1) Department of Chemical Physics, University of Science and Technology of China, 230026 Hefei, China;(2) National Synchrotron Radiation Laboratory, University of Science and Technology of China, 230029 Hefei, China;(3) State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China |
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| Abstract: | The structure and properties of Sm overlayer and Sm/Rh surface alloy have been investigated with Auger electron spectroscopy (AES), low energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS), and temperature programmed desorption spectroscopy (TDS). The growth of Sm on Rh(100) at room temperature (RT) appears following the Stranski-Krastanov growth mode and only the trivalent state Sm is observed from XPS results. Thermal treatment of the Sm film at 900 K leads to the formation of ordered surface alloy which shows the c(5√2 × √2)R45° and c(2×2) LEED patterns. Annealing the Sm film at temperature above 400 K makes the binding energy (B.E.) of Sm 3d5/2 shift to higher energy by 0.7 eV, which indicates charge transfer from Sm to Rh(100) substrate, causing the increase of CO desorption temperature. |
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| Keywords: | Sm film Rh(100) surface |
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