Determination of Space Group and Crystal Structure
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The Weissenberg photographs thus obtained are placed on the Weissenberg chart to find out the coordinates of the diffraction spots in the reciprocal space along with reciprocal cell dimensions and the indices of reflections can also be determined. It may be directly written either on the film or more conveniently on a tracing paper on which the diffraction spots of the Weissenberg have been already traced out. It may be pointed out here that the equi-inclination Weissenberg has some advantage over other settings. The form of the curves for other layer are same as zero layer and the same chart can be used for the interpretation of the photographs. Figure 7.9 is a typical example of zero layer Weissenberg as mentioned and the reason for the formation of festoons is also explained by Fig. 7.10.
KeywordsHeavy Atom Reciprocal Space Translational Symmetry Crystal Structure Analysis Crystal Structure Determination
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