Posted by Saad on April 9, 2015, 10:58 pm
I'm a bit confused about the way you obtain the Xray form factor in your book (equation 14.9). What we want to calculate is the structure factor, which is an integral over the unit cell, so how can we eventually convert it to an integral over all of space? The only way I can justify this change of limits is that the scattering potential for an atom is extremely shortranged, so it does not matter if we extend the limits to infinity.. 
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