Analysis of Low‐Energy Electron‐Diffraction Patterns from Simple Overlayer Surface Structures. II

1968 ◽  
Vol 49 (1) ◽  
pp. 147-155 ◽  
Author(s):  
P. W. Palmberg ◽  
T. N. Rhodin
Keyword(s):  
Electron Diffraction ◽  
Low Energy ◽  
Energy Electron ◽  
Surface Structures ◽  
Low Energy Electron Diffraction ◽  
Low Energy Electron ◽  
Diffraction Patterns

LOW-ENERGY ELECTRON HOLOGRAMS: PROPERTIES AND METHOD OF INVERSION

1997 ◽  
Vol 04 (03) ◽  
pp. 459-467 ◽  
Author(s):  
S. Y. TONG ◽  
T. P. CHU ◽  
HUASHENG WU ◽  
H. HUANG
Keyword(s):  
Electron Diffraction ◽  
Integral Transformation ◽  
Low Energy ◽  
Energy Electron ◽  
Wave Number ◽  
Large Wave ◽  
Low Energy Electron Diffraction ◽  
Low Energy Electron ◽  
Diffraction Patterns ◽  
Large Wave Number

We examine the differences between low-energy electron-diffraction patterns (holograms) and optical holograms. We show that electron-diffraction patterns in solids are not analogous to optical holograms because of strong dynamical factors. We also show that low-energy electron holograms can be inverted by a large-wave-number small-angle integral transformation. The grid sizes in wave number and angular spaces used in the transformation are derived.

Studies on surfaces of Zr(0001) that contain oxygen and show (2 × 2)-type low-energy electron diffraction patterns

1987 ◽  
Vol 65 (5) ◽  
pp. 464-467 ◽  
Author(s):  
P. C. Wong ◽  
K. A. R. Mitchell
Keyword(s):  
Electron Diffraction ◽  
Room Temperature ◽  
Low Energy ◽  
Energy Electron ◽  
Leed Pattern ◽  
Low Energy Electron Diffraction ◽  
Adsorption Sites ◽  
Low Energy Electron ◽  
Low Exposure ◽  
Diffraction Patterns

Oxygen chemisorption on the Zr(0001) surface has been studied in the low-exposure regime with Auger electron spectroscopy and measurements of the width of a half-order low-energy electron diffraction (LEED) beam. The new observations and conclusions are as follows. (i) The diffusion of O atoms to the bulk effectively starts at around 236 °C. (ii) Oxygen adsorbs in a disordered state at room temperature and orders sufficiently to show a (2 × 2)-type LEED pattern on heating to 220 °C. (iii) With increasing O exposure, 1/4, 1/2, and 3/4 of the available adsorption sites can be systematically filled, while showing the apparent (2 × 2)-LEED pattern, prior to the establishment of an ordered (1 × 1)-O surface. (iv) The process in (iii) can be reversed by starting with the (1 × 1)-O surface and heating above 236 °C.

Advanced Multiple Scattering Theories of Low-Energy Electron Diffraction (LEED)

1991 ◽  
Vol 253 ◽  
Author(s):  
M.A. Van Hove
Keyword(s):  
Electron Diffraction ◽  
Multiple Scattering ◽  
Complex Surface ◽  
Low Energy ◽  
Energy Electron ◽  
Surface Structures ◽  
Large Unit ◽  
Low Energy Electron Diffraction ◽  
Low Energy Electron ◽  
Large Unit Cell

ABSTRACTRecent advances in the theory of low-energy electron diffraction (LEED) are reviewed. They primarily concern methods to handle the multiple scattering of electrons in an atomiclattice. These advances have allowed the structure determination by LEED of complex surface structures, including large-unit-cell overlayers of molecules, disordered and incommensurate overlayers, complex reconstructions and adsorbate-induced relaxations.

Sign in / Sign up

Export Citation Format

Share Document