REPRODUCIBILITY TESTS OF EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE FORAQUA AND AMMINE COMPLEXES OF 1ST TRANSITION-METALS IN SOLID AND AQUEOUS-SOLUTION

X-ray absorption spectra of some aqua and ammine complexes of first tr ansition metals in solid and aqueous solution were measured and analyz ed repeatedly. The parameter values of their extended X-ray absorption fine structure (EXAFS) were reproducible within about 0.01 angstrom i n the interatomic distance and about 15% in the amplitude factor. Bett er reproducibilities were obtained for the samples for which the resid uals of fitting calculations were small. The ''error bar'' was also ca lculated according to the method suggested at the ''International Work shop on Standards and Criteria in X-Ray Absorption Spectroscopy, 1988' '. It was shown that the random errors can be as small as less-than-or -equal-to 0.001 angstrom in distance and less-than-or-equal-to 2% in a mplitude for samples with simple coordination shell structure.