Mossbauer spectroscopy hypothesis

The explanation of endotactic heterostructures in molecular dispersion for the X-ray anomalies of ammonia iron was proved by H. Topsoe by Mossbauer spectroscopy. The Mossbauer data imply the presence of small amounts of non-metal iron components which are present, however, as large particles of structural promoter oxides. They are located in grain boundaries and at the outer surface of the catalyst. This location also explains the SIMS data on Fe-Al-O fragments which were intended to support the hypothesis of endotactic heterostructures.The EXAFS data ° ° provide clear evidence for the identical average local coordination of iron in ammonia iron and normal iron. 

In Mossbauer spectroscopy, any sample is characterized hyju E), The simplest situation for recovering the jU E) function from experimental data is in transmission spectroscopy, where (p(E) = exp[-ju (E)d, There are two ways to find the ju E) function. The first involves a hypothesis concerning the nature of this function. Analysis of an experimental spectrum amounts to the determination of the parameters characterizing jU E) in accordance with the hypothesis. 

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