Abstract
When dealing with X-radiation of two near wavelengths, λ1 and λ2, from a crystal monochromator, M, incident on a small single crystal, c, interpretation of the interaction between the radiation and the specimen crystal is usually based on a single reciprocal lattice and two reflecting circles (spheres) of radii 1/λ1 and l/λ2 whose centres do not coincide. If one uses the alternative Ewald construction of a single reflecting circle (sphere) of unit radius (which uniquely defines the specimen crystal location) and two reciprocal lattices mutually parallel but dimensionally scaled as λ1:λ2 and with displaced origins, then this allows a more ready appreciation of the special relationships between the dispersion of the specimen crystal and that of the monochromator as θc changes, in particular, when θc equals arctan (0.5 tan θM), arctan (0.6 tan θM) or θM.
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Schedule a callMore From: Acta Crystallographica Section A Foundations of Crystallography
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