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Correction method for the asymmetry of the tangential beam in Couette (or Searle) geometry used in rheo-small-angle neutron scattering

Nettesheim, F; Olsson, Ulf LU ; Lindner, P and Richtering, W (2004) In Journal of Applied Crystallography 37(Pt 3). p.438-444
Abstract
A method of correcting the asymmetry in the scattering of the tangential beam configuration in a rheo-small-angle neutron scattering experiment is proposed. The asymmetry of the scattering in the tangential beam configuration can be attributed to the difference in pathlength for neutrons that are scattered toward compared with those which are scattered away from the axis of rotation of the shear cell. The pathlength problem is solved and a final expression for the two-dimensional scattering intensity is given. The results from these calculations are compared with experimental data, which offer a different option to correct this asymmetry, namely by just measuring the scattering of H2O/D2O mixtures with absolute scattering cross sections... (More)
A method of correcting the asymmetry in the scattering of the tangential beam configuration in a rheo-small-angle neutron scattering experiment is proposed. The asymmetry of the scattering in the tangential beam configuration can be attributed to the difference in pathlength for neutrons that are scattered toward compared with those which are scattered away from the axis of rotation of the shear cell. The pathlength problem is solved and a final expression for the two-dimensional scattering intensity is given. The results from these calculations are compared with experimental data, which offer a different option to correct this asymmetry, namely by just measuring the scattering of H2O/D2O mixtures with absolute scattering cross sections identical to those of the respective samples. However, the situation for anisotropic media is more complex and the correction procedure described here is less effective. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Applied Crystallography
volume
37
issue
Pt 3
pages
438 - 444
publisher
Wiley-Blackwell
external identifiers
  • wos:000221381500011
  • scopus:3442895642
ISSN
1600-5767
DOI
10.1107/S0021889804006910
language
English
LU publication?
yes
id
b895daf8-ad56-4936-9d75-0c84a512b6cd (old id 154054)
date added to LUP
2007-07-12 08:48:00
date last changed
2017-08-27 04:24:14
@article{b895daf8-ad56-4936-9d75-0c84a512b6cd,
  abstract     = {A method of correcting the asymmetry in the scattering of the tangential beam configuration in a rheo-small-angle neutron scattering experiment is proposed. The asymmetry of the scattering in the tangential beam configuration can be attributed to the difference in pathlength for neutrons that are scattered toward compared with those which are scattered away from the axis of rotation of the shear cell. The pathlength problem is solved and a final expression for the two-dimensional scattering intensity is given. The results from these calculations are compared with experimental data, which offer a different option to correct this asymmetry, namely by just measuring the scattering of H2O/D2O mixtures with absolute scattering cross sections identical to those of the respective samples. However, the situation for anisotropic media is more complex and the correction procedure described here is less effective.},
  author       = {Nettesheim, F and Olsson, Ulf and Lindner, P and Richtering, W},
  issn         = {1600-5767},
  language     = {eng},
  number       = {Pt 3},
  pages        = {438--444},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Applied Crystallography},
  title        = {Correction method for the asymmetry of the tangential beam in Couette (or Searle) geometry used in rheo-small-angle neutron scattering},
  url          = {http://dx.doi.org/10.1107/S0021889804006910},
  volume       = {37},
  year         = {2004},
}