7. Diatomic line. Consider a line of atoms ABAB... AB, with an A-B bond length of a. The form factors are f₁, fB for ato

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7 Diatomic Line Consider A Line Of Atoms Abab Ab With An A B Bond Length Of A The Form Factors Are F Fb For Ato 1 (66.7 KiB) Viewed 113 times

7. Diatomic line. Consider a line of atoms ABAB... AB, with an A-B bond length of a. The form factors are f₁, 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 nλ = a cos 0, where is the angle between the diffracted beam and the line of atoms. (b) Show that the intensity of the diffracted beam is proportional to f₁-fB1² for n odd, and to f₁ + f² for n even. (c) Explain what happens if f = fB.