05_02_09 - 27 George Thomson's experiment 02/09/2005 In a...

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Unformatted text preview: 27 George Thomson's experiment 02/09/2005 In a powdered, microcrystalline substance there is always some crystal which has the correct angle for constructive interference 2d cos = n Diffraction pattern Each ring corresponds to one type of crystal planes. Foil of a few 100nm Cathode rays K=50keV , O=0.05A A magnetic field can change the rings, showing the the waves are associated with the electron charge. ( $ % & !" ' # ! ( 0 3 5 4 5 1 Georg.Hoffstaetter@Cornell.edu 28 Ultrafast Electron Diffraction U$ U$ Georg.Hoffstaetter@Cornell.edu 29 :DYHV LQ (OHFWURQ 0LFURVFRSHV 02/09/2005 6ROHQRLG OHQVHV K=200keV , O=0.025A 6H[WXSROH OHQVHV % & ' ! # 0 Georg.Hoffstaetter@Cornell.edu ( 1 30 Formation of optical images At low exposure, the few photons that lead to a reaction in a photographic plate are statistically distributed. Hits of individual photons can be observed. 02/09/2004 With increasing exposure, the interferences of electromagnetic waves that refract in the lens of the camera and form the image become apparent. The image formed by many photons forms corresponds to the image formed by interfering electromagnetic waves. Georg.Hoffstaetter@Cornell.edu ...
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05_02_09 - 27 George Thomson's experiment 02/09/2005 In a...

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