weak phase object approximation
weak phase object approximation
An approximation that is used for interpreting an HREM image. A specimen is regarded as an object that does not change the amplitude of the incident electron wave but slightly changes the phase of the wave. This approximation holds well for a very thin specimen composed of light atoms. In this case, a structure image obtained at Scherzer focus exhibits the projected potential of a crystal. When the specimen is thick, image interpretation is necessary by applying dynamical diffraction that takes account of multiple scattering.
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