TY - JOUR
T1 - Smearing effects in `pinhole' collimation with one-dimensional detection
AU - Register, R. A.
AU - Cooper, S. L.
N1 - Funding Information:
One of the authors (RAR) thanks Dr Stevan R. Hubbard and Soichi Wakatsuki for initial discussions regarding the importance of desmearing 'pinhole' collimation SAXS data, and James G. Homan for his continuing interest. RAR also thanks S. C. Johnson & Sons and the Fannie and John Hertz Foundation for financial support while this work was performed. Partial support of this research by the Division of Materials Research of the National Science Foundation through grant DMR 86-03839 is gratefully acknowledged.
Publisher Copyright:
© 1988, Wiley-Blackwell. All rights reserved.
PY - 1988
Y1 - 1988
N2 - Owing to the recent availability of intense X-ray sources, small-angle X-ray scattering experiments can now be performed with pseudo-pinhole collimation. However, smearing effects are still present in `pinhole' data collected with one-dimensional detectors, owing to both the finite size of the beam and particularly the finite width of the detector window or mask. The smearing effects are shown to be severe at very low scattering vectors, leading to grossly incorrect values of the correlation lengths determined for samples with a random two-phase morphology. Though the degree of smearing induced by `pinhole' collimation is smaller than that from slit collimation, the effect on the correlation lengths determined from the smeared data is similar in magnitude for common camera parameters. With simulated data and incorporation of both random noise and a truncated q range, it is shown that data can be desmeared using the iterative method of Lake [Acta Cryst. (1967), 23, 191–194] to yield reasonable values of the correlation length.
AB - Owing to the recent availability of intense X-ray sources, small-angle X-ray scattering experiments can now be performed with pseudo-pinhole collimation. However, smearing effects are still present in `pinhole' data collected with one-dimensional detectors, owing to both the finite size of the beam and particularly the finite width of the detector window or mask. The smearing effects are shown to be severe at very low scattering vectors, leading to grossly incorrect values of the correlation lengths determined for samples with a random two-phase morphology. Though the degree of smearing induced by `pinhole' collimation is smaller than that from slit collimation, the effect on the correlation lengths determined from the smeared data is similar in magnitude for common camera parameters. With simulated data and incorporation of both random noise and a truncated q range, it is shown that data can be desmeared using the iterative method of Lake [Acta Cryst. (1967), 23, 191–194] to yield reasonable values of the correlation length.
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U2 - 10.1107/S0021889888006764
DO - 10.1107/S0021889888006764
M3 - Article
AN - SCOPUS:84889431949
SN - 0021-8898
VL - 21
SP - 550
EP - 557
JO - Journal of Applied Crystallography
JF - Journal of Applied Crystallography
IS - 5
ER -