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X-Ray Diffraction Methods

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8/3/2019 X-Ray Diffraction Methods

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X-ray diffraction methods
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yDiscovery

yMethodsyOriginy

GenerationyInteraction of x-ray withmatter
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DiscoveryyRoentgen

yBariumplatinocyanideyUnknown-x rays
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MethodsyAbsorption

yDiffractionyfluorescence
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y

Theoryinvolved
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originyEMS-0.1 to 100 angstromsyAnalytical purposes-0.7 to 2

angstroms
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GenerationyHigh velocity electrons impinge on

metal target-x rays are generated.
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Bohrs theory of atomic

spectrayK-x ray

yEnergyyFrequency

yExample:cu

yMinimum wavelength

yMoseley equation
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Interaction of x-ray with matteryAbsorption

yScattering & DiffractionyFluorescence
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AbsorptionyBeers law

yWavelength vs mass absorptioncoefficient-series ofdiscontinuties(absorptionedges)
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Scattering & Diffraction

yBraggs law

yn=2dsin
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FluorescenceyWavelength-type of elements

yIntensity-amount of elements

yNon destructive method

yVery little sample
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