Transcription of Chapter 2 - Physical Methods for Characterizing Solids
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Chapter 2 - Physical Methods for Characterizing Solids
1X-rays were discovered by Wilhelm Rontgen, a German physicist in generate x-rays, three things are needed. a source of electrons a means of accelerating the electrons at high speeds a target material to receive the impact of the electrons and interact with them. Typical cathode element is difference is 20-50 must be water (wavelength) depends on the anode metal, often Cu, Mo, Co. Lines occur because bombarding electrons knock out e-from K shell (n = 1), which are filled by electrons in higher shells. Electrons falling from L shell (n = 2) give rise to Kalines, whereas e-from M shell (n = 3) give the Kblines.
2 Monochromatic radiation (single wavelength or a narrow range of wavelengths) is required for X-ray diffraction. •Typically, the Kαline is selected and the K βline is filtered out by using a thin metal foil of the adjacent (Z-1) element.
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