Example:Particle spacing from peak position

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Consider the case of trying to measure the particle-particle spacing from the q-value of a particular peak. The interpretation of the q value of course depends upon the packing of the particles; i.e. the unit cell. Consider a cubic unit cell (SC, BCC, FCC). Note that in general:

Since , and since , the realspace spacing of planes is:

BCC 110

Note that for BCC, the particle-particle distance is given by:

So we expect: