Theory of phase correlations in localized inelastic electron diffraction and imaging

作者: Z.L. Wang , J. Bentley

DOI: 10.1016/0304-3991(91)90119-Q

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摘要: Abstract A dynamical theory is proposed starting from the coupled wave equations for describing inelastic electron scattering in perfect crystals and with defects. The phase correlations of localized occurring at different atomic sites can be statistically evaluated before any numerical calculations, essentially providing an easy way treating coherence, incoherence or partial coherence diffraction. time average diffraction lattices thermal vibration configurations performed just a single calculation. It shown that vibrations result streaking spots. possible streaks 2D reciprocal space τ predicted by examining Σ l 1 cos[ ·( R − )] monatomic system , where are 3D positions th atom within unit cell its first nearest neighbors located same plane perpendicular to incidence beam direction, respectively. TDS on lines satisfying )=0. This rule also applied multiatomic cases if differences made structure factors considered. Also this should allow determination strong interaction relationships orientation patterns. described calculate intensities diffuse (TDS) streaks. Theoretical schemes calculating energy-filtered images patterns after exciting inner-shell, Z -contrast scanning transmission microscopy (STEM). Some experimental evidence demonstrate spot corresponding theoretical interpretations.

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