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

L3-Edge anomalous scattering of x-rays by praseodymium and samarium