Report copyright - segre/phys570/15S/lecture_14.pdfScattering Amplitude Fcrystal(Q~) = XN l f l(Q~)ei Q~~r l = XN R~ n+~r j f j(Q~)ei Q ~(Rn+~r j) = X j f j(Q~)ei Q ~~r j X n eiQRn = Funit cellFlattice
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