Keywords :
Mie scattering; USANS; USAXS; coherent multiple scattering; ultra-small-angle X-ray scattering; ultra-small-angle neutron scattering; Experiment modeling; Model approximations; Multiple-scattering; Small angle scattering; Small-angle scattering; Ultra small angle x ray scattering; Biochemistry, Genetics and Molecular Biology (all)
Abstract :
[en] We start from an analytical formulation for the coherent multiple scattering treatment - similar to Mie scattering - for spherical particles. Then, we revisit the Born approximation with an approximation for all higher-order terms. Finally, we draw conclusions from those calculations and formulate an approximative model to describe ultra-small-angle neutron scattering and ultra-small-angle X-ray scattering data. In all calculations, we can specify the conditions for coherent multiple scattering. Several examples are provided to show the quality of the simple approximation in comparison with exact calculations and experiments.
Funding text :
We thank Liliana de Campo and Jitendra Mata from the instrument Kookaburra at ANSTO for providing scattering data. We thank Hitoshi Endo (JAEA, Japan) and Michael Monkenbusch (JCNS, Germany) for providing the original scattering data of microemulsions under film contrast. We thank Vitaliy Pipich from the instrument KWS-3 at FRM II, Garching, for providing measurements on BSA protein aggregates that were formulated by Frank Schreiber and Fajun Zhang at University T\u00FCbingen. No external funding has been raised for this research. Open access funding enabled and organized by Projekt DEAL. CJG is grateful to Fonds De La Recherche Scientifique \u2013 FNRS, Belgium, for a research associate position.
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