L3-EDGE ANOMALOUS SCATTERING OF X-RAYS BY PRASEODYMIUM AND SAMARIUM

摘要: Measurements are reported for the anomalous scattering of x-rays by atoms praseodymium and samarium at wavelengths through their L/sub 3/ absorption edges. Values both f' f'', real imaginary components scattering, were derived from diffraction experiments using synchrotron radiation. Both exhibit exceptionally large changes in a narrow interval wavelength, which offer useful tool solving phase problem crystal structure analysis. Crystals sodium ethylenediaminetetraacetate octahydrate isomorphorphous samarium, crystallize noncentric space group Fdd2. The atomic coordinates thermal parameters determined Mo K..cap alpha.. values found terms plotted, listed, with respective R each data set. For set, exhibits striking resonance line is observed curves. 1 figure, 2 tables.