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X-ray diffraction is now used in an increasingly routine fashion for the measurement of charge densities in solids. The development of the method over the past decades is described briefly. The course of a modern charge-density analysis is outlined and the features of the aspherical atoms used in...
The science of crystals involves symmetry. Symmetry is also an excellent link to other fields of human endeavor. The first scientific crystallographer, Johannes Kepler, came to the idea of close packing when he was considering the symmetry of snow crystals. When Louis Pasteur observed crystal and...