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Student Number 91222029
Author Kuang-Cheng Kao()
Author's Email Address kaoest0209@yahoo.com.tw
Statistics This thesis had been viewed 1709 times. Download 823 times.
Department Physics
Year 2003
Semester 2
Degree Master
Type of Document Master's Thesis
Language English
Title Mass Transport of Adsorbate During Reversible faceted/planar phase transition for Pd/W(111) and Pd/Mo/W(111)
Date of Defense 2003-06-17
Page Count 59
Keyword
  • phase transition
  • Abstract We have used Temperature Programmed Auger (TPA) and Temperature Progammed Low Energy Electron Diffraction (TPLEED) and Temperature Progammed Desorption (TPD) to study the effect of temperature on the surface structure of Pd/W(111) and Pd/Mo/W(111) in an ultrahigh vacuum (UHV) chamber with a base pressure of 1 x 10-10 torr. In Pd/W(111) surfaces, we can get the real-time information of the surface at high temperature and then observe the reversible faceted/planar phase transition. Furthermore, TPA reveals that the apparent coverage of Pd changes across the transition. When the planar (111) surface appears, the wetting layer of Pd slightly reduces to about 1.2PML (physical monolayer). Besides, the coverage of Pd slightly raises about 0.1PML in the faceted surface below the temperature of the phase transition. In the case of Pd/Mo/W(111) surfaces, when the coverage of Mo is added to about 1PML, the temperature of phase transition reduces 300K and the width of the hysteresis also reduces by 45K. In addition, the phase transition becomes less apparent. Thus, the behavior of Pd on Mo/W(111) is closer and closer to that of Pd/Mo(111) as more and more Mo is added. For even thicker Mo layers, surprisingly, the temperature (as well as its width) of the phase transition is lowered with the increased coverage of Mo.
    Table of Content Contents
    AbstractKKKKKKKKKKKKKKKKKKKKKKKKK.ii
    List of FiguresKKKKKKKKKKKKKKKKKKKKKK...v
    List of AbbreviationsKKKKKKKK..............................................vii
    1.IntroductionKKKKKKKKKKKKKKKKKKKKKK.1
         ReferencesKKKKKKKKKKKKKKKKKK..KKK..3
    2.Basic Concepts of Ultrathin Film GrowthKKKKKKKKK.....5
    3.Analytical Tools and TheoryKKKKKKKKKKKKKKK...8
    3.1Auger Electron Spectroscopy (AES)KKKKKKKKKK.....8
    3.1.1Principle of AESKKKKKKKKKKKKKKKKK8
    3.1.2Setup of AESKKKKKKKKKKKKKKKKKK10
    3.1.3Temperature Programmed Auger (TPA)KKKKKKK..10
    3.2Low Energy Electron Diffraction (LEED)KKKKKKKKK11
    3.2.1Principle of LEEDKKKKKKKKKKKKKKKK11
    3.2.2Setup of LEEDKKKKKKKKKKKKKKKKK.13
    3.2.3Temperature Programmed Low Energy Electron
         Diffraction (TPLEED)KKKKKKKKKKKKKK13
    3.3Temperature Programmed Thermal Desorption (TPD)KKKK.14
    3.3.1Principle of TPDKKKKKKKKKKKKKKKK..14
    3.3.2Setup of TPDKKKKKKKKKKKKKKKKKK16
    3.3.3ApplicationsKKKKKKKKKKKKKKKKKK.16
         ReferencesKKKKKKKKKKKKKKKKKK..KKK20
    4.Experimental Apparatus and ProcedureKKKKKKKKKK.21
    4.1   ApparatusKKKKKKKKKKKKKKKKKKKK..21
    4.2   ExperimentKKKKKKKKKKKKKKKKKKK...22
    5.Results and DiscussionKKKKKKKKKKKKKKKKK..24
    5.1Pd/W SystemKKKKKKKKKKKKKKKKKKK..24
    5.1.1  Calculation of the Pd Apparent ThicknessKKKKKK..24
    5.1.2  Reversible Phase Transition and Influence of
         3-d ClustersKKKKKKKKKKKKKKKKKK.29
    5.2   Pd/Mo/W SystemKKKKKKKKKKKKKKKKKK.40
    5.2.1  Calculation of the Mo Apparent Thickness from Effective
         Attenuation LengthsKKKKKKKKKKKKKK.....40
    5.2.2  Apparent Thickness-Dependent Effects of MoKKKK...44
         ReferencesKKKKKKKKKKKKKKKKKKKKK48
    6.    ConclusionKKKKKKKKKKKKKKKKKKKKKK...49
    BibliographyKKKKKKKKKKKKKKKKKKKKKKK50
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    Advisor
  • Cheng-Hsun Nien(ߥ)
  • Files
  • 91222029.pdf
  • approve immediately
    Date of Submission 2004-06-23

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