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MSE 225
Lecture on Diffracted Intensities
Part 1
Dr. Alberto V. Amorsolo, Jr.Professor, UP DMMME
April 18, 2015
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At the end of the lecture the student is
expected to:
1. Describe the interaction of x-rays withelectrons (bound electrons, free electronsand loosely bound electrons)
2. Describe the interaction of x-rays with atoms
3. Identify factors that affect intensity of thescattered x-ray at a given point in space
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Intensities of diffracted beams
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Scattering of x-ray by an electron
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Scattering of x-ray by an electron
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Scattering of x-ray by an electron
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Phase change during scattering
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Intensity Equation
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• On the average Ey = Ez since E is perfectly
random
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• Total intensity at P is sum of the intensities of
the two components
IP
= Ipy
+ IPz
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Compton Effect
• Occurs when x-rays encounter loosely bound
or free electrons
• Treating x-rays as photons with energy h1
,
collision of an x-ray photon with an electron is
similar to an elastic collision between two
billiard balls
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Compton Effect
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Undesirable Compton Effect
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Scattering of x-ray by an atom
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END OF MODULE
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