Two-dimensional boundary conditions and finite-size effects in angle-resolved photoelectron emission spectroscopy, low-energy electron diffraction, and high-resolution electron-energy-loss spectroscopy

1988 ◽  
Vol 37 (6) ◽  
pp. 2884-2891 ◽  
Author(s):  
S. Y. Tong ◽  
H. C. Poon
Keyword(s):  
Size Effects ◽  
Emission Spectroscopy ◽  
Finite Size ◽  
Photoelectron Emission ◽  
Finite Size Effects ◽  
Low Energy Electron Diffraction ◽  
Resolution Electron ◽  
Dimensional Boundary ◽  
Low Energy Electron ◽  
Electron Energy Loss

Chemisorption Geometry, Vibrational Spectra, and Thermal Desorption of Formic Acid on TiO2(110)

1998 ◽  
Vol 05 (01) ◽  
pp. 381-385 ◽  
Author(s):  
S. A. Chambers ◽  
M. A. Henderson ◽  
Y. J. Kim ◽  
S. Thevuthasan
Keyword(s):  
Formic Acid ◽  
Photoelectron Spectroscopy ◽  
High Energy ◽  
Decomposition Products ◽  
X Ray ◽  
Low Energy Electron Diffraction ◽  
Resolution Electron ◽  
Low Energy Electron ◽  
Temperature Programmed ◽  
Electron Energy Loss

We have used high-energy X-ray photoelectron spectroscopy and diffraction (XPS/XPD), low-energy electron diffraction (LEED), high-resolution electron energy loss spectroscopy (HREELS) and temperature-programmed desorption (TPD) to determine the molecular orientation, long-range order, vibrational frequencies, and desorption temperatures for formic acid and its decomposition products on TiO 2(110). Molecular adsorption occurs at coverages approaching one monolayer, producing a weakly ordered (2 × 1) surface structure. High-energy XPD reveals that the formate binds rigidly in a bidentate fashion through the oxygens to Ti cation rows along the [001] direction with an O–C–O bond angle of 126 ± 4°. During TPD some surface protons and formate anions recombine and desorb as formic acid above 250 K. However, most of the decomposition products follow reaction pathways leading to H 2 O , CO and H 2 CO desorption. Water is formed in TPD below 500 K via the abstraction of lattice oxygen by deposited acid protons.

Interaction of Pt Films With ZnO(0001) and ZnO(0001)

1994 ◽  
Vol 357 ◽  
Author(s):  
W.T. Petrie ◽  
J.M. Vohs
Keyword(s):  
Low Energy ◽  
Layer By Layer ◽  
Electronic Interactions ◽  
Low Energy Electron Diffraction ◽  
Growth Structure ◽  
Barrier Formation ◽  
Resolution Electron ◽  
Low Energy Electron ◽  
Pt Films ◽  
Electron Energy Loss

AbstractThe growth, structure, and electronic properties of Pt films supported on the (0001) and (0001) surfaces of ZnO were investigated using high-resolution electron energy-loss spectroscopy (HREELS) and low-energy electron diffraction (LEED). Vapor-deposited Pt films were found to grow in a layer-by-layer fashion on both surfaces and exhibited hexagonal LEED patterns. HREELS results indicate that there are only weak electronic interactions at the Pt/ZnO(0001) interface, while charge transfer and Schottky barrier formation occurs at the Pt/ZnO(0001) interface.

Hydrogen On Semiconductor Surfaces

1998 ◽  
Vol 513 ◽  
Author(s):  
J. A. Schaefer ◽  
T. Balster ◽  
V. Polyakov ◽  
U. Rossow ◽  
S. Sloboshanin ◽  
...  
Keyword(s):  
High Resolution ◽  
Electron Diffraction ◽  
Photoelectron Spectroscopy ◽  
Low Energy ◽  
Semiconductor Surfaces ◽  
Hydrogen Passivation ◽  
Low Energy Electron Diffraction ◽  
Resolution Electron ◽  
Low Energy Electron ◽  
Electron Energy Loss

ABSTRACTWe review structural and electronic aspects of the reaction of hydrogen with semiconductor surfaces. Among others, we address the Si(100), GexSi1-x(100), GaAs(100), InP(100), SiC(100), SiC(0001) and SiC(0001) surfaces. It is demonstrated that high resolution electron energy loss spectroscopy (HREELS) in conjunction with a number of other surface sensitive techniques like low energy electron diffraction (LEED) and photoelectron spectroscopy (XPS/UPS) can yield important information about the surface atomic structure, the effects of hydrogen passivation and etching and on electronic properties of the surfaces.

Adsorption of Oxygen on Sodium Saturated Cu{110}

1986 ◽  
Vol 83 ◽  
Author(s):  
D. E. Grider ◽  
J. F. Wendelken
Keyword(s):  
Photoelectron Spectroscopy ◽  
Low Energy ◽  
Sticking Coefficient ◽  
X Ray ◽  
Low Energy Electron Diffraction ◽  
Metallic Character ◽  
Resolution Electron ◽  
Initial Oxygen ◽  
Low Energy Electron ◽  
Electron Energy Loss

ABSTRACTThe adsorption of oxygen on a sodium saturated Cu{110} surface is examined with x-ray photoelectron spectroscopy (XPS) in an extension of a previous study of this system which utilized low energy electron diffraction (LEED), and high resolution electron energy loss spectroscopy (HREELS). The sodium overlayer, despite the presence of an initial oxide contaminant, shows metallic character. Intentionally adsorbed oxygen is in a different chemical state than the initial oxygen contaminant and causes a reduction in the metallic character of the sodium. The sticking coefficient for oxygen on the sodium saturated surface is almost three times greater than for the bare Cu{11O} surface.

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