Multiple‐Scattering Effects in High‐Energy Electron‐Molecule Collisions. II Polyatomic Molecules

1972 ◽  
Vol 57 (4) ◽  
pp. 1686-1693 ◽  
Author(s):  
Albert C. Yates
Keyword(s):  
Multiple Scattering ◽  
High Energy ◽  
Polyatomic Molecules ◽  
Energy Electron ◽  
High Energy Electron ◽  
Scattering Effects ◽  
Multiple Scattering Effects

scholarly journals Comparison of azimuthal plots for reflection high-energy positron diffraction (RHEPD) and reflection high-energy electron diffraction (RHEED) for Si(111) surface

2020 ◽  
Vol 76 (3) ◽  
pp. 328-333
Author(s):  
Zbigniew Mitura
Keyword(s):  
Electron Diffraction ◽  
Diffraction Theory ◽  
High Energy ◽  
Energy Electron ◽  
Formation Mechanisms ◽  
High Energy Electron ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scattering Effects ◽  
Multiple Scattering Effects

Azimuthal plots for RHEPD (reflection high-energy positron diffraction) and RHEED (reflection high-energy electron diffraction) were calculated using dynamical diffraction theory and then compared. It was assumed that RHEPD and RHEED azimuthal plots can be collected practically by recording the intensity while rotating the sample around the axis perpendicular to the surface (for the case of X-ray diffraction, such forms of data are called Renninger scans). It was found that RHEPD plots were similar to RHEED plots if they were compared at Bragg reflections of the same order. RHEPD plots can also be determined in the region of total external reflection and for such conditions multiple scattering effects turned out to be very weak. The findings for azimuthal plots are also discussed in the context of the formation mechanisms of Kikuchi patterns.

Multiple scattering analysis of reflection high-energy electron diffraction intensities from GaAs(110)

1988 ◽  
Vol 128 (8) ◽  
pp. 447-450 ◽  
Author(s):  
S.Y. Tong ◽  
T.C. Zhao ◽  
H.C. Poon ◽  
K.D. Jamison ◽  
D.N. Zhou ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Multiple Scattering ◽  
High Energy ◽  
Energy Electron ◽  
High Energy Electron

INTERPRETATION OF REFLECTION HIGH ENERGY ELECTRON DIFFRACTION FROM DISORDERED SURFACES: DYNAMICAL THEORY AND ITS APPLICATION TO THE EXPERIMENT

1999 ◽  
Vol 06 (03n04) ◽  
pp. 461-495 ◽  
Author(s):  
UWE KORTE
Keyword(s):  
Electron Diffraction ◽  
Multiple Scattering ◽  
Surface Science ◽  
Phonon Scattering ◽  
High Energy ◽  
Dynamical Theory ◽  
Energy Electron ◽  
Advanced Materials ◽  
Quantitative Interpretation ◽  
High Energy Electron

Reflection high energy electron diffraction (RHEED) is one of the few surface science techniques that are applied in a fabrication process, namely to monitor the epitaxial growth of ultrathin films and advanced materials. In spite of this technological relevance the multiple scattering nature of the involved scattering processes has hindered the quantitative interpretation of RHEED in the case of real, i.e. imperfect, surfaces for a long time. This article reviews recent progress in the understanding of RHEED from surfaces exhibiting various types of disorder. It concentrates on a multiple scattering formalism — based on perturbation theory with the nonperiodic part of the structure as perturbation — that allows the computation and interpretation of RHEED from real systems. The validity regime of the approach is discussed. We demonstrate the potential of the method by its application to the quantitative interpretation of experimental data. The range of treated problems comprises occupational disorder, intensity oscillations, structure of disordered metal/adsorbate systems, diffuse scattering from adatoms, Kikuchi scattering and phonon scattering.

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