In the chapter about scattering amplitudes you state the relation
V(x) = sum(f_j %Delta (x - x_j) ) where f_j are the form factors.
I don't understand, how this equation relates to the definition of the form factor (see equation 14.9) and the statement that V(x) is the sum of the scattering potentials from all atoms.
Is there a way to derive this equation from the formula of the form factors?
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