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Diffraction Paterns Exercise


 The zone axis (ZA) is the direction lying in all the planes shown in the slice of reciprocal space represented in the diffraction pattern, i.e. the vector perpendicular to all the g vectors in the pattern.

Take any two g vectors, g1 (h1k1l1) and g2 (h2k2l2) from the diffraction pattern. The zone axis is given by the vector product::

vectorProduct.gif (681 bytes)

The zone axis is parallel (or nearly parallel) to the electron beam direction.



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