![]() Possible causes of the short period discrepancy have been investigated, but an adequate explanation has not been found. It indicates that the crystals used do not have the flat-topped Darwin-Ewald-Prins diffraction pattern. A single crystal pattern is deduced, based mainly on the observed (1,-1) curve, with asymmetry as indicated by the (1,+1) and (2,+2) curves. In this way it is found that the curves are consistent as regards Fourier components of long period and large amplitude, but inconsistent in the short period, small amplitude components. The X-ray Diffraction facility provides the screening, testing and complete data collection from X-ray diffraction of single crystals, either from protein. The reliability of the components obtained can be tested by predicting the (1,-1) curve with them and comparing with experiment. The method requires resolution of the observed curves into Fourier components, and a numerical method of doing this is described. The equations have been applied to rocking curves of Mo K α 1 from calcite, supplied by L. A method of modifying the equations of the instrument to allow for a simple type of mosaic structure is indicated. When the wavelength of the radiation is comparable with or smaller than the lattice. Although from Smith's very general viewpoint, six experimental curves are needed for a complete analysis, it is shown that for rocking curves from calcite, taken with the usual type of double spectrometer, it should be possible to deduce the shape of the single crystal diffraction pattern from two rocking curves, the (1,+1) and (2,+2). individual atoms of a crystal results in ordinary optical refraction. This makes X-rays suitable for crystallography, as its wavelength and crystal lattice parameters are both in the scale of angstroms (). The method of analysis of double spectrometer rocking curves developed by L. Diffraction occurs when a wave meets a set of regularly spaced scattering objects, and its wavelength of the distance between the scattering objects are of the same order of magnitude.
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