The role of Frenkel excitons in low-energy-electron diffraction theory for molecular crystals

1978 ◽  
Vol 90 (2) ◽  
pp. 260-272 ◽  
Author(s):  
R. Nuyts ◽  
P. Phariseau
Keyword(s):  
Electron Diffraction ◽  
Molecular Crystals ◽  
Diffraction Theory ◽  
Low Energy ◽  
Energy Electron ◽  
Low Energy Electron Diffraction ◽  
Low Energy Electron ◽  
Frenkel Excitons

The role of an energy-dependent inner potential in quantitative low-energy electron diffraction

2000 ◽  
Vol 458 (1-3) ◽  
pp. 155-161 ◽  
Author(s):  
S Walter ◽  
V Blum ◽  
L Hammer ◽  
S Müller ◽  
K Heinz ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Low Energy ◽  
Energy Electron ◽  
Low Energy Electron Diffraction ◽  
Low Energy Electron ◽  
Energy Dependent

Theory of transmission low-energy electron diffraction

1993 ◽  
Vol 51 ◽  
pp. 696-697
Author(s):  
W. Qian ◽  
J.C.H. Spence
Keyword(s):  
Electron Diffraction ◽  
Diffraction Theory ◽  
Bloch Wave ◽  
Low Energy ◽  
Energy Electron ◽  
Band Theory ◽  
Total Electron ◽  
Dynamical Diffraction ◽  
Low Energy Electron Diffraction ◽  
Low Energy Electron

Interpretation of the images from a point source electron microscope requires a detailed analysis of transmission low energy electron diffraction. Here we present a general approach for solutions to the mixed Bragg-Laue case in transmission LEED (100-1000eV), based on the dynamical diffraction theory of Bethe. However, the validity of the dynamical diffraction theory to low energy electrons can be justified by its connection to the band theory for low energy crystal electrons.Assume that the incident beam forms a plane wave and the crystal is a thin slab. According to Bethe, the total electron wavefield within crystal can be written as a linear combination of Bloch waves (equation 1). The Bloch wave excitation coefficients b(j) can be determined by matching the boundary conditions, the wave amplitudes Cg(j) and the wave vectors k(j) for each Bloch wave can be obtained by solving the time independent Schrodinger equations (equation 2).

The role of the renninger effect in low energy electron diffraction

Vacuum ◽  
1990 ◽  
Vol 41 (1-3) ◽  
pp. 349-351 ◽  
Author(s):  
P Martin ◽  
Pv Blanckenhagen ◽  
U Romahn ◽  
W Schommers
Keyword(s):  
Electron Diffraction ◽  
Low Energy ◽  
Energy Electron ◽  
Low Energy Electron Diffraction ◽  
Low Energy Electron
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