difr_el - R Electron diffraction LEP 5.1.13 Related topics...

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5.1.13 Electron diffraction PHYWE series of publications • Laboratory Experiments • Physics • PHYWE SYSTEME GMBH • 37070 Göttingen, Germany 25113 1 Related topics Bragg reflection, Debye-Scherrer method, lattice planes, gra- phite structure, material waves, de Broglie equation. Principle and task Fast electrons are diffracted from a polycrystalline layer of gra- phite: interference rings appear on a fluorescent screen. The interplanar spacing in graphite is determined from the dia- meter of the rings and the accelerating voltage. Equipment Electron diffr. tube a. mounting 06721.00 1 High voltage supply unit, 0-10 kV 13670.93 1 High-value resistor, 10 MOhm 07160.00 1 Connecting cord, 50 KV, 500 mm 07366.00 1 Power supply, 0. ..600 VDC 13672.93 1 Vernier caliper, plastic 03011.00 1 Connecting cord, 250 mm, red 07360.01 2 Connecting cord, 250 mm, blue 07360.04 2 Connecting cord, 750 mm, red 07362.01 2 Connecting cord, 750 mm, yellow 07362.02 1 Connecting cord, 750 mm, blue 07362.04 1 Connecting cord, 750 mm, black 07362.05 2 Problems 1. To measure the diameter of the two smallest diffraction rings at different anode voltages. 2. To calculate the wavelength of the electrons from the anode voltages. 3. To determine the interplanar spacing of graphite from the relationship between the radius of the diffraction rings and the wavelength. Set-up and procedure Set up the experiment as shown in Fig. 1. Connect the sockets of the electron diffraction tube to the power supply as shown in Fig. 2. Connect the high voltage to the anode G3
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difr_el - R Electron diffraction LEP 5.1.13 Related topics...

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