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Electron diffraction from a powder material gives a ring pattern. When the incoming beam is tilted an angle ¦È relative to the optical axis the ring pattern moves. Calculate the angle ¦È the incoming beam has been tilted when the center of the DP is moved so it falls on the {222} ring of the original pattern. The material is Pt (fcc) with a lattice constant 0.392 nm. The acceleration voltage is 100 kV. (Courtesy Anders Thølen.)
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