Correlated Thermal Diffuse Scattering in Low to Medium Energy Electron Diffraction: A New Structural Tool

1999 ◽  
Vol 82 (2) ◽  
pp. 335-338 ◽  
Author(s):  
T. Abukawa ◽  
C. M. Wei ◽  
T. Hanano ◽  
S. Kono
Keyword(s):  
Electron Diffraction ◽  
Diffuse Scattering ◽  
Energy Electron ◽  
Medium Energy ◽  
Thermal Diffuse Scattering ◽  
Thermal Diffuse

The effect of the surface on thermal diffuse intensities in reflection high energy electron diffraction

1993 ◽  
Vol 440 (1910) ◽  
pp. 567-588 ◽  
Keyword(s):  
Electron Diffraction ◽  
Differential Cross Section ◽  
Cross Section ◽  
Diffuse Scattering ◽  
High Energy ◽  
Energy Electron ◽  
High Energy Electron ◽  
Thermal Diffuse Scattering ◽  
Vibrational Excitations ◽  
Thermal Diffuse

The contributions of bulk and surface vibrational excitations to thermal diffuse scattering (TDS) in reflection high energy electron diffraction (RHEED) patterns are investigated. It is shown that the surface phonon contribution to the differential cross-section for TDS is comparable to that from bulk phonons. Many-beam dynamical TDS RHEED calculations are presented, and both the positions and heights of diffuse peaks are shown to differ appreciably from predictions of kinematical TDS RHEED theory

Coupled thermal diffuse-atomic inner shell scattering in electron diffraction

1994 ◽  
Vol 52 ◽  
pp. 994-995
Author(s):  
Z. L. Wang
Keyword(s):  
Electron Diffraction ◽  
Diffuse Scattering ◽  
Dynamical Theory ◽  
Inelastic Electron ◽  
Thermal Diffuse Scattering ◽  
Transmission Electron ◽  
Diffraction Patterns ◽  
Electron Energy Loss ◽  
Thermal Diffuse ◽  
Electron Energy Loss Spectra

In electron diffraction patterns, diffuse scattering at high angles is primarily generated by phonon, or thermal diffuse, scattering (TDS). Techniques were introduced to acquire the electron energy-loss spectra (EELS) of high-angle thermal-diffuse-scattered electrons (TDS-EELS) in a transmission electron microscope (TEM). With regards to the scattering mechanism, the TDS-EELS core ionization edge intensity was believed to be generated primarily by TDS - single electron, double-inelastic electron scattering processes. It was concluded from experimental data that the signal from coupled phonon - atomic inner shell excitations is stronger than that from atomic inner shell excitation alone. A formal dynamical theory is presented in this paper to illustrate the theoretical basis of the experimental observations. The theory can be applied to calculate the diffraction patterns of inelastically double-scattered electrons and the signal intensity observed in TDS-EELS.TDS is actually a statistically averaged, quasi-elastic scattering of the electrons by the crystal lattice of different thermal vibration configurations.

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