Diatomic line. Consider a line of atoms ABAB... AB, with an A-B bond lengtlh of sa. The form factors are fa» fp 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 nd = a cos 0, where 0 is the angle between the diffracted beam and the line of atoms. (b) Show that the intensity of the diffracted beam is proportional to |f, - fB° for n odd, and to |f, + frl° for n even. (c) Explain what happens if fa = fB-
Diatomic line. Consider a line of atoms ABAB... AB, with an A-B bond lengtlh of sa. The form factors are fa» fp 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 nd = a cos 0, where 0 is the angle between the diffracted beam and the line of atoms. (b) Show that the intensity of the diffracted beam is proportional to |f, - fB° for n odd, and to |f, + frl° for n even. (c) Explain what happens if fa = fB-
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Transcribed Image Text:Diatomic line. Consider a line of atoms ABAB... AB, with an A-B bond lengtlh
of sa. The form factors are fa» fp 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 nd = a cos 0, where 0 is the angle between the diffracted beam and the line of
atoms. (b) Show that the intensity of the diffracted beam is proportional to |f, - fB°
for n odd, and to |f, + frl° for n even. (c) Explain what happens if fa = fB-
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