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Example of indexing with an unknown electron beam orientation
If φ were 72.5° and we were to measure the ratio x/y and find it to be numerically
equal to 1.66 then we could be reasonably convinced that the dot at Y could be labelled as the 200 spot, and the dot at X
could be labelled as 113. In this case our predicted electron beam direction is in the direction common to the 200 and 113
planes, i.e. [03
]. This particular electron diffraction pattern
has a central rectangular repeat. If this is correct, further spots on this diffraction pattern can be indexed in a self-consistent
manner by vector addition.
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