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Date: 16-7-2017
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Date: 24-10-2020
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Date: 13-7-2017
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The Electron Diffraction Tube
The electron diffraction experiment where we sent a beam of electrons through a graphite crystal, can be viewed either as an experiment to demonstrate the wave nature of electrons or as an experiment to study the structure of a graphite crystal. Perhaps both.
The apparatus, shown in Figure (1), consists of an evacuated tube with an electron gun at one end, a graphite target in the middle, and a phosphor screen at the other end. A finely collimated electron beam can be aimed to strike an individual flake of graphite, producing a single crystal diffraction pattern on the phosphor screen. Usually you hit more than one crystal and get a multiple image on the screen, but with some adjustment you can usually obtain a single crystal image.
Figure 1: Electron diffraction apparatus. An electron beam, produced by an electron gun, strikes a graphite crystal located near the center of the evacuated tube. The original beam and the scattered electrons strike a phosphor screen located at the end of the tube.
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إدارة الغذاء والدواء الأميركية تقرّ عقارا جديدا للألزهايمر
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شراء وقود الطائرات المستدام.. "الدفع" من جيب المسافر
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ضمن مؤتمر الإمام الحجة(عجل الله فرجه) العلمي باحث كويتي يناقش إثبات ولادة الإمام المهدي (عجّل الله فرجه) من التّوقيعات الشّريفة
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