Scanning tunneling microscopy studies of chemisorbed layers on metal surfaces
- California Univ., Berkeley, CA (USA). Dept. of Chemistry Lawrence Berkeley Lab., CA (USA)
Scanning Tunneling Microscopy (STM) is introduced as a technique for surface studies by outlining the tunneling process, the instrument capabilities, and the experimental requirements. STM theory is summarized, beginning with a simple description of quantum tunneling. Metal-vacuum-metal junction theory is presented using Bardeen's transfer Hamiltonian formalism. Most STM imaging theory is based on this construct. A review of the theoretical work pertaining directly to STM concludes the summary. STM studies of adsorbates are introduced with a brief description of surface chemical bond classifications, adsorbate interactions and adsorbate concentration effects. Following this is a review of previous STM work done on metal surfaces in Ultra-High Vacuum (UHV). Since the structure of the metal surface itself influences adsorbate geometry, both clean and adsorbate covered surfaces are discussed. The design and operation of a new STM is described. A review of other designs is presented for comparison. The microscope fits standard UHV systems as an add-on instrument. The techniques, Auger Electron Spectroscopy (AES), and Low Energy Electron Diffraction (LEED) are described since these surface sensitive methods are used to characterize the adsorbate systems studied. The surface structure of a graphitic carbon overlayer on a Pt(111) single crystal has been imaged with atomic resolution. The real space surface structure of the sulfur chemisorption series on Re(0001) surfaces has been imaged. While the saturation coverage structure ((2{radical}3 {times} 2{radical}3)R30{degree}) passivates the surface and can be imaged in air, the sub-saturation coverage structures can only be studied in UHV.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6712130
- Report Number(s):
- LBL-28965; ON: DE90015623
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
METALS
CHEMISORPTION
RHENIUM
SURFACES
ELECTRON MICROSCOPY
ELECTRON DIFFRACTION
GRAPHITE
LAYERS
PLATINUM
SUBSTRATES
SULFUR
ULTRAHIGH VACUUM
CARBON
CHEMICAL REACTIONS
COHERENT SCATTERING
DIFFRACTION
ELEMENTAL MINERALS
ELEMENTS
MICROSCOPY
MINERALS
NONMETALS
PLATINUM METALS
SCATTERING
SEPARATION PROCESSES
SORPTION
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
360102 - Metals & Alloys- Structure & Phase Studies