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Sample geometry effects on incoherent small‐angle scattering of light water
Author(s) -
Carsughi F.,
May R. P.,
Plenteda R.,
Saroun J.
Publication year - 2000
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889899013643
Subject(s) - scattering , neutron scattering , monte carlo method , neutron , small angle neutron scattering , small angle scattering , optics , physics , quasielastic scattering , chemistry , nuclear physics , statistics , mathematics
Light water is frequently used as a standard for calibrating small‐angle neutron scattering (SANS) data. The intensities collected for 1 and 2 mm of light water in standard quartz cells may differ by up to about 50% due to the presence of multiple and inelastic scattering [Rennie & Heenan (1993). Proceedings of ISSI Meeting, Dubna, pp. 254–260, Report E3‐93‐65; Teixeira (1992). Structure and Dynamics of Strongly Interacting Colloids and Supramolecular Aggregates in Solution , edited by S. H. Chen, pp. 625–658. Dordrecht: Kluwer Academic Publishers]. Multiple scattering increases with the thickness of the sample. The use of only elastically scattered neutrons may lead to an absolute intensity of the SANS data of about a factor of 2 higher than that obtained by taking into account all of the neutrons on the detector [Ghosh & Rennie (1990). Inst. Phys. Conf. Ser. 107 , 233–244]. However, it is shown here that the scattering intensities collected with different ratios of sample‐to‐beam dimension do present large differences as a function of sample thickness. In particular, ratios smaller and larger than unity are considered and the results are discussed and compared with Monte Carlo simulations.