Abstract
The differential equations of the two-beam dynamical theory of electron diffraction in an absorbing single crystal are, ignoring unimportant phase factors:where T(z) and S(z) are the transmitted and diffracted amplitudes, the mean and anomalous absorption distances; to is the extinction distance, z the foil thickness, Sg the macroscopic deviation parameter, ḡ the reciprocal lattice vector and R the displacement function of any defect present in the crystal. Occasionally, but not often, these equations can be handled by standard techniques; the wave vectors allowed in the crystal can be determined and the transmitted and diffracted waves expressed as linear combinations of waves with these wave vectors.
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More From: Proceedings, annual meeting, Electron Microscopy Society of America
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