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Combined Fitting of Small- and Wide-Angle X-ray Total Scattering Data from Nanoparticles: Benefits and Issues

Published

Author(s)

Igor Levin, Anton Gagin, Andrew J. Allen

Abstract

Simultaneous fitting of small- and wide-angle total X-ray scattering data for nanoparticles has been explored using both simulated and experimental signals. The nanoparticle types included core/shell metal and quantum-dot CdSe systems. Explicit incorporation of the small-angle scattering (SAS) data in the fit consistently returned more accurate particle-size distribution parameters than those obtained by fitting the wide-angle scattering (WAS) data alone. In particular, a popular method for fitting the Fourier transform of the WAS data (i.e. a pair-distribution function), in which the omitted SAS part is represented using a parametric function, typically yielded significantly incorrect results. The Pareto optimization method combined with a genetic algorithm has been shown effective for combined fitting of the SAS and WAS data. We proposed an approach for identifying the most optimal solution from the Pareto set.
Citation
Journal of Applied Crystallography

Keywords

nanoparticles, X-ray scattering, small-angle scattering, wide-angle scattering, pair-distribution function

Citation

Levin, I. , Gagin, A. and Allen, A. (2014), Combined Fitting of Small- and Wide-Angle X-ray Total Scattering Data from Nanoparticles: Benefits and Issues, Journal of Applied Crystallography, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=914719 (Accessed June 18, 2024)

Issues

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Created February 1, 2014, Updated February 19, 2017