Dynamics of thermal diffuse scattering in high-energy electron diffraction and imaging: Theory and experiments

1992 ◽  
Vol 65 (3) ◽  
pp. 559-587 ◽  
Author(s):  
Z. L. Wang
Keyword(s):  
Electron Diffraction ◽  
Diffuse Scattering ◽  
High Energy ◽  
Energy Electron ◽  
High Energy Electron ◽  
Thermal Diffuse Scattering ◽  
Imaging Theory ◽  
Thermal Diffuse ◽  
Theory And Experiments

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

scholarly journals Diffraction theory of phonon-scattered electrons

1991 ◽  
Vol 49 ◽  
pp. 788-789
Author(s):  
Z. L. Wang
Keyword(s):  
Diffuse Scattering ◽  
Diffraction Theory ◽  
High Energy ◽  
Small Time ◽  
High Energy Electron ◽  
Thermal Diffuse Scattering ◽  
Cell Position ◽  
Image Position ◽  
Thermal Vibrations ◽  
Thermal Diffuse

Electron-phonon interactions are inelastic scattering processes in high-energy electron diffraction, and are responsible for thermal diffuse scattering (TDS). The atomic thermal vibrations introduce a small time-dependent perturbation to the crystal potential(1)where is the displacement of the atom (at position within the hth unit cell (position R(h)) from its equilibrium position,(2)

Kinematic Approximations in TED and RHEED Analysis of Reconstructed Surfaces

1990 ◽  
Vol 48 (2) ◽  
pp. 396-397
Author(s):  
L. -M. Peng ◽  
M. J. Whelan
Keyword(s):  
Electron Diffraction ◽  
Kinematic Analysis ◽  
Incident Beam ◽  
High Energy ◽  
Energy Electron ◽  
Great Success ◽  
High Energy Electron ◽  
Kinematic Approximation ◽  
Reconstructed Surfaces

In recent years there has been a trend in the structure determination of reconstructed surfaces to use high energy electron diffraction techniques, and to employ a kinematic approximation in analyzing the intensities of surface superlattice reflections. Experimentally this is motivated by the great success of the determination of the dimer adatom stacking fault (DAS) structure of the Si(111) 7 × 7 reconstructed surface.While in the case of transmission electron diffraction (TED) the validity of the kinematic approximation has been examined by using multislice calculations for Si and certain incident beam directions, far less has been done in the reflection high energy electron diffraction (RHEED) case. In this paper we aim to provide a thorough Bloch wave analysis of the various diffraction processes involved, and to set criteria on the validity for the kinematic analysis of the intensities of the surface superlattice reflections.The validity of the kinematic analysis, being common to both the TED and RHEED case, relies primarily on two underlying observations, namely (l)the surface superlattice scattering in the selvedge is kinematically dominating, and (2)the superlattice diffracted beams are uncoupled from the fundamental diffracted beams within the bulk.

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