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Comparison of azimuthal plots for reflection high‐energy positron diffraction (RHEPD) and reflection high‐energy electron diffraction (RHEED) for Si(111) surface
Author(s) -
Mitura Zbigniew
Publication year - 2020
Publication title -
acta crystallographica section a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.742
H-Index - 83
ISSN - 2053-2733
DOI - 10.1107/s2053273320001205
Subject(s) - reflection high energy electron diffraction , electron diffraction , reflection (computer programming) , diffraction , azimuth , gas electron diffraction , bragg's law , scattering , optics , physics , materials science , computer science , programming language
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.