Abstract
The thermal neutron cross section for scattering by crystalline-electric field (CEF) levels is d2 σ/dΩdω = A x f2 (Q), where A includes physical and instrumental parameters, and f(Q) is the magnetic from factor of the ion being measured. The intensity of a neutron energy transfer peak resulting from a CEF level, measured at any Q value, is proportionl to f2 (Q) when all quantities in A are kept constant. The Q dependence of the form factor can therefore be derived from an energy analysis of the neutrons scattered from a powder sample, at several Q values. This method is suitable for paramagnetic ions having defined CEF levels (especially the rare earth ions). The method was utilizedby the authors for measuring the form factor of Pr3+ in PrF3, Ho3+ in HoCrO3 and U4+ in UPd3. The measurements were carried out on the triple axis neutron spectrometer KANDI III at the NRCN. The results agree with those found in the literature.
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