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Learning about SANS instruments and data reduction from round robin measurements on samples of polystyrene latex

Rennie, Adrian R.; Hellsing, Maja S.; Wood, Kathleen; Gilbert, Elliot P.; Porcar, Lionel; Schweins, Ralf; Dewhurst, Charles D.; Lindner, Peter; Heenan, Richard K. and Rogers, Sarah E., et al. (2013) In Journal of Applied Crystallography 46. p.1289-1297
Abstract
Measurements of a well-characterized 'standard' sample can verify the performance of an instrument. Typically, small-angle neutron scattering instruments are used to investigate a wide range of samples and may often be used in a number of configurations. Appropriate 'standard' samples are useful to test different aspects of the performance of hardware as well as that of the data reduction and analysis software. Measurements on a number of instruments with different intrinsic characteristics and designs in a round robin can not only better characterize the performance for a wider range of conditions but also, perhaps more importantly, reveal the limits of the current state of the art of small-angle scattering. The exercise, followed by... (More)
Measurements of a well-characterized 'standard' sample can verify the performance of an instrument. Typically, small-angle neutron scattering instruments are used to investigate a wide range of samples and may often be used in a number of configurations. Appropriate 'standard' samples are useful to test different aspects of the performance of hardware as well as that of the data reduction and analysis software. Measurements on a number of instruments with different intrinsic characteristics and designs in a round robin can not only better characterize the performance for a wider range of conditions but also, perhaps more importantly, reveal the limits of the current state of the art of small-angle scattering. The exercise, followed by detailed analysis, tests the limits of current understanding as well as uncovering often forgotten assumptions, simplifications and approximations that underpin the current practice of the technique. This paper describes measurements of polystyrene latex, radius 720 angstrom, with a number of instruments. Scattering from monodisperse, uniform spherical particles is simple to calculate and displays sharp minima. Such data test the calibrations of intensity, wavelength and resolution as well as the detector response. Smoothing due to resolution, multiple scattering and polydispersity has been determined. Sources of uncertainty are often related to systematic deviations and calibrations rather than random counting errors. The study has prompted development of software to treat modest multiple scattering and to better model the instrument resolution. These measurements also allow checks of data reduction algorithms and have identified how they can be improved. The reproducibility and the reliability of instruments and the accuracy of parameters derived from the data are described. (Less)
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published
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Journal of Applied Crystallography
volume
46
pages
1289 - 1297
publisher
International Union of Crystallography
external identifiers
  • wos:000324764500006
  • scopus:84884547595
ISSN
1600-5767
DOI
10.1107/S0021889813019468
language
English
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yes
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75c4bbbd-ee34-4ae3-b541-0698ef6b40e0 (old id 4095875)
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2013-10-28 11:28:34
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2019-08-14 01:16:34
@article{75c4bbbd-ee34-4ae3-b541-0698ef6b40e0,
  abstract     = {Measurements of a well-characterized 'standard' sample can verify the performance of an instrument. Typically, small-angle neutron scattering instruments are used to investigate a wide range of samples and may often be used in a number of configurations. Appropriate 'standard' samples are useful to test different aspects of the performance of hardware as well as that of the data reduction and analysis software. Measurements on a number of instruments with different intrinsic characteristics and designs in a round robin can not only better characterize the performance for a wider range of conditions but also, perhaps more importantly, reveal the limits of the current state of the art of small-angle scattering. The exercise, followed by detailed analysis, tests the limits of current understanding as well as uncovering often forgotten assumptions, simplifications and approximations that underpin the current practice of the technique. This paper describes measurements of polystyrene latex, radius 720 angstrom, with a number of instruments. Scattering from monodisperse, uniform spherical particles is simple to calculate and displays sharp minima. Such data test the calibrations of intensity, wavelength and resolution as well as the detector response. Smoothing due to resolution, multiple scattering and polydispersity has been determined. Sources of uncertainty are often related to systematic deviations and calibrations rather than random counting errors. The study has prompted development of software to treat modest multiple scattering and to better model the instrument resolution. These measurements also allow checks of data reduction algorithms and have identified how they can be improved. The reproducibility and the reliability of instruments and the accuracy of parameters derived from the data are described.},
  author       = {Rennie, Adrian R. and Hellsing, Maja S. and Wood, Kathleen and Gilbert, Elliot P. and Porcar, Lionel and Schweins, Ralf and Dewhurst, Charles D. and Lindner, Peter and Heenan, Richard K. and Rogers, Sarah E. and Butler, Paul D. and Krzywon, Jeffery R. and Ghosh, Ron E. and Jackson, Andrew and Malfois, Marc},
  issn         = {1600-5767},
  language     = {eng},
  pages        = {1289--1297},
  publisher    = {International Union of Crystallography},
  series       = {Journal of Applied Crystallography},
  title        = {Learning about SANS instruments and data reduction from round robin measurements on samples of polystyrene latex},
  url          = {http://dx.doi.org/10.1107/S0021889813019468},
  volume       = {46},
  year         = {2013},
}