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05_02_09 - 27 George Thomsons experiment In a powdered...

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[email protected] 27 02/09/2005 George Thomson’s experiment In a powdered, microcrystalline substance there is always some crystal which has the correct angle for constructive interference λ α n d = cos 2 A magnetic field can change the rings, showing the the waves are associated with the electron charge. Cathode rays Foil of a few 100nm Diffraction pattern Each ring corresponds to one type of crystal planes. K=50keV , O =0.05A
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[email protected] 28 Ultrafast Electron Diffraction U±$² U±$²
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[email protected] 29 02/09/2005 :DYHV³LQ³(OHFWURQ³0LFURVFRSHV
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