Transmission Electron Microscopy of Minerals and Rocks by Alex C. McLaren

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Sample text

A variant of CDF imaging is the weak-beam (WB) mode. In this mode, the specimen is tilted away from the orientation for CDF imaging until the centered diffracted beam is of low intensity, but care must be taken to ensure that no other diffracted beams are strongly excited. WB images of dislocations are much narrower than strong-beam BF or CDF images. Therefore, this type of imaging is particularly useful for studying regions of high dislocation density and the dissociation of dislocations into partials.

Since the theory makes no assumptions about the nature of the wave or about the detailed mechanism of the interaction of the wave with the scattering points, it is applicable to x-rays, electrons, and neutrons. 1. Diagram used for the calculation of the phase difference of the waves scattered by two lattice points. 1. The position of P2 relative to Pi is given by the vector r, and the wavevector of the scattered wave is Kg. We want the phase difference between the two scattered waves at Q, a point at a distance R (»PiP2) from Px and P2.

7. (a) Object function for a single slit and (b) its Fourier transform. 8. (a) Object function for a diffraction grating and (b) its Fourier transform. +x Principles of image formation by a lens 19 states that any periodic function f(x) can be expressed as the sum of a series of sinusoidal functions which have spatial periods that are integral submultiples of the fundamental spatial period d of/(*). Zero is counted as an integer, thus making the first term of the series a constant. 25) and substitution of this into Eq.

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