Diatomic line. Consider a line of atoms A B A B …A B, with an A-B bond length of (1)/(2) a. The form factors are fA, fB for atoms A, B, respectively. The incident beam of x -rays is perpendicular to the line of atoms. (a) Show that the interference condition is n λ=a cosθ, where θis the angle between the diffracted beam and the line of atoms. (b) Show that the intensity of the diffracted beam is proportional to |fA-fB|^2 for n odd, and to |fA fB|^2 for n even. (c) Explain what happens if fA=fB.

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