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Solid State Physics: X-Ray scattering
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[QUOTE="M Quack, post: 5004741, member: 396278"] (a) Bragg's law states: lambda = 2d_hkl sin(theta), where d_hkl=2 pi/|G_hkl| Lambda is fixed by the x-ray source, so you can find the smallest angle by looking at sin(theta)=lambda/(2d_hkl)=|G_hkl| sin(theta)/(4pi). Which value of d or G gives the smallest theta? (b) Setting the detector at the right angle is not the only condition that must be met. When you draw the usual sketch of Bragg diffraction, how is the angle theta drawn/measured? (See the figure next to "Bragg condition" on the Wiki page) [URL]http://en.wikipedia.org/wiki/Bragg%27s_law[/URL] (c) should be clear if you understand (b). If not, read the first section of the Wiki page: [URL]http://en.wikipedia.org/wiki/Powder_diffraction[/URL] [/QUOTE]
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Solid State Physics: X-Ray scattering
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