Objective: Observe the diffraction of electrons on polycrystalline graphite and confirm the wave nature of electrons
The diffraction of electrons on a polycrystalline graphite foil provides evidence for the wave nature of electrons. It is possible to observe two diffraction rings surrounding a central spot on the axis of the beam on the fluorescent screen of the electron diffraction tube. These rings are caused by the diffraction of electrons at those lattice planes of the microcrystals in the graphite foil that satisfy the Bragg condition. The phenomenon is similar to the results obtained in the Debye-Scherrer diffraction of X-rays by a crystalline powder.
![Experiment: Electron Diffraction (230 V, 50/60 Hz), 8000704 [UE5010500-230], Fundamentals of Atomic Physics](/imagelibrary/UE5010500-230/UE5010500-230_01_Experiment-Electron-Diffraction-230-V-5060-Hz.jpg)
![Experiment: Electron Diffraction (230 V, 50/60 Hz), 8000704 [UE5010500-230], Fundamentals of Atomic Physics](/thumblibrary/UE5010500-230/UE5010500-230_01_1200_1200_Experiment-Electron-Diffraction-230-V-5060-Hz.jpg)
![15根安全实验导线套件，75mm, 1002843 [U138021], 电循环](/thumblibrary/U138021/U138021_01_140_140_15根安全实验导线套件-75mm.jpg)
![高压电源5kV（230 V，50/60 Hz）, 1003310 [U33010-230], 供电器](/thumblibrary/U33010-230/U33010-230_01_140_140_高压电源5kV-230-V-5060-Hz.jpg)
![Teltron 管座 S, 1014525 [U185002], 电子管 S](/thumblibrary/U185002/U185002_01_140_140_Teltron-管座-S.jpg)
![电子衍射试管, 1013889 [U185711], 电子管S](/thumblibrary/U185711/U185711_01_140_140_电子衍射试管.jpg)
![高频接插线,BNC/4毫米插头, 1002748 [U11257], 实验用导线和电缆](/thumblibrary/U11257/U11257_01_140_140_高频接插线-BNC4毫米插头.jpg)
![直流电源0 – 20 V, 0 – 5 A (230 V, 50/60 Hz), 1003312 [U33020-230], 供电器](/thumblibrary/U33020-230/U33020-230_01_140_140_直流电源0-20-V-0-5-A-230-V-5060-Hz.jpg)
![Planck’s Constant Apparatus (230 V, 50/60 Hz), 1000537 [U10700-230], 杂项](/thumblibrary/U10700-230/U10700-230_01_140_140_Planck-s-Constant-Apparatus-230-V-5060-Hz.jpg)
![高频接插线，长1m, 1002746 [U11255], 实验用导线和电缆](/thumblibrary/U11255/U11255_01_140_140_高频接插线-长1m.jpg)
![电压电源0-500 V (230 V, 50/60 Hz), 1003308 [U33000-230], 供电器](/thumblibrary/U33000-230/U33000-230_01_140_140_电压电源0-500-V-230-V-5060-Hz.jpg)
![弗兰克-赫兹实验氖管加热器, 1000912 [U8482230], 弗兰克—赫兹实验](/thumblibrary/U8482230/U8482230_01_140_140_弗兰克-赫兹实验氖管加热器.jpg)
![弗兰克-赫兹实验用电源供应器（230 V，50/60 Hz）, 1012819 [U8482530-230], 弗兰克—赫兹实验](/thumblibrary/U8482530-230/U8482530-230_01_140_140_弗兰克-赫兹实验用电源供应器-230-V-5060-Hz.jpg)
![数字式示波器，2x30 MHz, 1020910 [U11834], 高阶示波器](/thumblibrary/U11834/U11834_01_140_140_数字式示波器-2x30-MHz.jpg)
![Experiment: Planck’s constant (230 V, 50/60 Hz), 8000700 [UE5010200-230], Fundamentals of Atomic Physics](/thumblibrary/UE5010200-230/UE5010200-230_01_140_140_Experiment-Planck-s-constant-230-V-5060-Hz.jpg)
![数字万用表 P1035, 1002781 [U11806], 手持数字测量仪器](/thumblibrary/U11806/U11806_01_140_140_数字万用表-P1035.jpg)
![Digital Multimeter P3340, 1002785 [U118091], 手持数字测量仪器](/thumblibrary/U118091/U118091_01_140_140_Digital-Multimeter-P3340.jpg)
![Pair of Safety Experiment Leads, 75 cm, blue, red, 1017718 [U13816], 实验用导线和电缆](/thumblibrary/U13816/U13816_01_140_140_Pair-of-Safety-Experiment-Leads-75-cm-blue-red.jpg)
![Red Laser Diode, 650 nm, 1003201 [U22000], 位于支架上的光学灯](/thumblibrary/U22000/U22000_01_140_140_Red-Laser-Diode-650-nm.jpg)
![模拟万用表 ESCOLA 100, 1013527 [U8557380], 手持模拟测量仪器](/thumblibrary/U8557380/U8557380_01_140_140_模拟万用表-ESCOLA-100.jpg)
![Experiment: Franck-Hertz Experiment for Neon (230 V, 50/60 Hz), 8000714 [UE5020400-230], Atomic shells](/thumblibrary/UE5020400-230/UE5020400-230_01_140_140_Experiment-Franck-Hertz-Experiment-for-Neon-230-V-5060-Hz.jpg)
![Teltron亥姆霍兹线圈S, 1000611 [U185051], 电子管的实验](/thumblibrary/U185051/U185051_01_140_140_Teltron亥姆霍兹线圈S.jpg)