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研究生： 李訓名
Hsun-Ming Lee
論文名稱： 電子光能譜系統的組裝與測試
Assembly and Characterization of an Inverse Photoemission System
指導教授： 崔古鼎
Ku-Ding Tsuei
口試委員:
學位類別： 碩士
Master
系所名稱： 理學院 - 物理學系
Department of Physics
論文出版年： 2007
畢業學年度： 95
語文別： 英文
論文頁數： 43
中文關鍵詞： 電子光能譜 、鎳(111) 、氧化鎳(111) 、p(2x2) 氧吸附
外文關鍵詞： Inverse Photoemission Spectroscopy (IPES), Ni(111), NiO(111), p(2x2) O adsorption
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    • I have reassembled a whole inverse photoemission system (IPES) system and performed calibration on the optical system. This system has a resolution of 0.32 eV for first-order diffraction of Helium I radiation, and 0.14 eV for first-order diffraction of Lyman α radiation. The overall resolution is 0.54 eV at 22.28 eV beam energy determined by the Fermi edge of a thick gold film, primarily from spot size and energy spread of electron beam. The methods of improving the resolution are discussed.
    The IPES experiments on sputtered Ni(111) and on oxidized Ni(111) were conducted. Nickel has a peak around 0.5 eV, which is ascribed to d band above the Fermi energy (EF). The oxidized nickel has one wide peak around 3 ~ 4 eV relative to EF and another peak around 13 eV, similar to the characteristics of nickel oxide in the literature.

    Chapter 1 Introduction to Inverse Photoemission Spectroscopy 1.1 Comparison with Photoemission 1.2 Types of IPES 1.2.1 Isochromat Mode 1.2.2 Spectrograph Mode References Figures Chapter 2 Characterization of the Optical System 2.1 Chamber and Instruments 2.1.1 Chamber 2.1.2 Electron Gun 2.1.3 Detector 2.1.4 Grating 2.2 Testing and Calibration 2.2.1 Electron Gun 2.2.2 Helium I Radiation 2.2.3 Lyman α Radiation 2.2.4 Gold Film References Figures Chapter 3 Experiment 3.1 Nickel and Its Interaction with Oxygen 3.2 Sputtering and Annealing 3.3 Clean Ni(111) 3.4 Oxidized Nickel 3.5 Energy Spectra 3.5.1 Literature 3.5.2 Experimental Result 3.6 Chemisorbed Oxygen References Figures Appendix A Notes on the Electron Gun Cathode B Retarding Potential Method C Geometry of Sample, Grating and Detector D Commands of MCA2D and MCA Programs E Data Collecting and Data Converting F Heating Tapes G Type E Thermocouple

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