Lecture on Diffracted Intensities

8/18/2019 Lecture on Diffracted Intensities

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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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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

Lecture on Diffracted Intensities

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