Cs adsorption on a polar NbC(111) surface: photoemission and auger electron spectroscopy studies |
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| Institution: | 1. Department of Chemistry, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan;2. Photon Factory, National Laboratory for High Energy Physics (KEK), Tsukuba-shi, Ibaraki 305, Japan;3. National Institute for Research in Inorganic Materials, Tsukuba-shi, Ibaraki 305, Japan;1. Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. CSIRO Manufacturing, Bag 10, Clayton South, Victoria 3169, Australia;4. Center for Computational Energy Research, Department of Applied Physics, Eindhoven University of Technology, 5600MB Eindhoven, The Netherlands;5. MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400044, China;6. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;7. Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China;8. Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China;9. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China;10. School of Physics and Electronics, Central South University, Changsha 410083, China;11. Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping, Sweden;12. Institute of Applied Physics and Materials Engineering, University of Macau, Macau 999078, China;13. College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, China;14. College of Materials Science and Engineering, Jilin University, Changchun 130012, China;15. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China;p. Center for Applied Chemistry, School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China;q. Faculty of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan;r. School of Materials Science and Engineering, Shandong University, Jinan 250061, China;s. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;t. Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Normal University, Xi’an 710119, China;u. Nanomaterials Centre, School of Chemical Engineering, The University of Queensland, St Lucia, QLD 4072, Australia;v. Institute of Photoelectronic Thin Film Devices and Technology, Nankai University, Tianjin 300350, China;w. College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China;x. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;1. Key Lab of Microsystem and Microstructure (Ministry of Education), Harbin Institute of Technology, No. 2 YiKuang Street, Harbin 150080, China;2. Department of Environmental Science and Engineering, Heilongjiang University, Harbin 150080, China |
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| Abstract: | The Cs adsorption process on a NbC(111) surface has been studied with core-level photoemission spectroscopy (PES) and Auger electron spectroscopy (AES). Coverage-dependent Cs 4d core-level PES shows that the polarization-depolarization transition of the Cs overlayer occurs in the coverage region of 0.5 ≤ θ ≤ 0.8 ML where the work function shows a minimum value. The charge transfer in the initial stage of adsorption is investigated using valence-related AES, and it is found that the transfer of the Cs 6s charge to the substrate occurs in the polarized phase. |
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