Transcription of ELECTRON DIFFRACTION
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ELECTRON DIFFRACTIONELECTRON DIFFRACTIONREFERENCEI nstruction Manual: ELECTRON DIFFRACTION Tube - Welch Scientific Co. Cat. No. 2639 - (available atthe Resource Centre).INTRODUCTIONThis experiment is a demonstration of thewave nature of the ELECTRON , and providesa confirmation of the de Broglierelationship:(1) hpwhere = ELECTRON wavelength, h =Planck's constant, p = ELECTRON also provides an introduction to the useof DIFFRACTION in the analysis of guide sheet outlines a method for the analysis of cubic crystal forms, this being useful to youfor interpreting the transmission DIFFRACTION pattern produced by scattering electrons off a thin filmtarget of polycrystalline aluminium. The apparatus also contains samples with hexagonal are pyrolytic graphite targets, and are available both as single crystals and in the methodology of analysis of the hexagonal crystal, and for additional material on cubiccrystals, see the DE BROGLIE WAVELENGTHThe voltmeter measures the accelerating potential of the electrons in the tube.
The aluminium target is a powder of small crystal flakes, i.e., it is polycrystalline. Thus the diffraction pattern appears as rings. There are also many possible planes that may be drawn through the crystal lattice, and in a powder sample in general all of these will be present. A simple example of this is shown in Figure 1.
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