![]() The grazing angle of incidence is given by formula(1), in our caseĢ6.6°. The wavelength of a diffracted beam needs to satisfy the Bragg condition. Taken together, we find an angle of 53.2° between the Laueīeam and the x-rays that go straight through the crystal. Also the angle of reflection must be equal to the angle of (201) planes and the incoming and transmitted beam are both equal toĢ6.6°. Planes is given by the inner product of the normalized directionĪs indicated in the figure, this gives that the angles of the diffracting The direction of this beam is found by geometry - it does not depend on ![]() ![]() Indicated Laue beam, which produces a spot on the film. The Bragg condition will give rise to the Constructive interference of wavelengths that satisfy The beam reflects off the (201) planes, which are perpendicular to the Polychromatic x-ray beam enters the crystal along the Z-direction. The Y-direction are perpendicular to the plane of the drawing. The figure shows an XZ-plane of a simple cubic crystal. We will also determine the wavelength of the Laue beams,Īnd check if this is consistent with the high voltage on the x-ray anode. This lab we will also assign the Laue spots to the crystal planes that In most applications only the symmetry of the Laue pattern is used. Parallel to the body diagonal of the unit cell produces a 3-fold direction) produces Laue patterns with 4-fold symmetry. InĬubic crystals, an incoming beam parallel to one of the unit cell edges (a When the incoming beam is parallel to a high-symmetryĭirection of the crystal, the Laue pattern also has high symmetry. Precisely known orientation, for example for polishing a surface or forĭoing measurements. Laue diffraction is most often used for mounting single crystals in a Laue diffraction Laue diffraction Orientation of single crystals
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