Difference between xrd and x ray crystallography
Answers
Answer:
By measuring the angles and intensities of these diffracted beams, a crystallographer can produce a three- dimensional picture of the density of electrons within the crystal. ... X-Ray Crystallography uses the uniformity of light diffraction of crystals to determine the structure of a molecule or atom
Answer:
The X-ray diffraction intensity is in proportional proportional to the crystal volume and therefore also crystal mass because larger the volume or mass the larger the number of scattering atoms or scattering centers. Well here we assume that the absorption effect is negligible which is of course not true always. Also we assume that the X-ray beam size is larger than the crystal size. With normal X-ray single crystal diffractometry with Cu, Mo or Ag targets one should choose a small single crystal of the order of about 0.1 mm in linear dimension. This size will enable you to get good set of data for structure refinements because the absorption and extinction with be small. Also it is nice to use a single crystal of well defined size with known crystal faces or a spherical crystal if you can make it. With high energy X-ray diffraction with synchrotron radiation one can use bigger crystals of size of a few mm. For neutron diffraction on the other hand you need a crystal of the size of a few mm say 2x2x3 mm^3. With medium energy X-ray diffraction at a synchrotron X-ray source you can use crystals of micron size and still get good data set.