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| 001 | 894027 | ||
| 005 | 20210919010945.0 | ||
| 024 | 7 | _ | |a 10.1063/5.0053446 |2 doi |
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| 024 | 7 | _ | |a 1089-7690 |2 ISSN |
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| 100 | 1 | _ | |a Gommes, Cedric |0 P:(DE-Juel1)184674 |b 0 |e Corresponding author |u fzj |
| 245 | _ | _ | |a Inelastic neutron scattering analysis with time-dependent Gaussian-field models |
| 260 | _ | _ | |a Melville, NY |c 2021 |b American Institute of Physics |
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| 520 | _ | _ | |a Converting neutron scattering data to real-space time-dependent structures can only be achieved through suitable models, which is particularly challenging for geometrically disordered structures. We address this problem by introducing time-dependent clipped Gaussian field models. General expressions are derived for all space- and time-correlation functions relevant to coherent inelastic neutron scattering for multiphase systems and arbitrary scattering contrasts. Various dynamic models are introduced that enable one to add time-dependence to any given spatial statistics, as captured, e.g., by small-angle scattering. In a first approach, the Gaussian field is decomposed into localized waves that are allowed to fluctuate in time or to move either ballistically or diffusively. In a second approach, a dispersion relation is used to make the spectral components of the field time-dependent. The various models lead to qualitatively different dynamics, which can be discriminated by neutron scattering. The methods of this paper are illustrated with oil/water microemulsion studied by small-angle scattering and neutron spin-echo. All available data—in both film and bulk contrasts, over the entire range of q and τ—are analyzed jointly with a single model. The analysis points to the static large-scale structure of the oil and water domains while the interfaces are subject to thermal fluctuations. The fluctuations have an amplitude of around 60 Å and contribute to 30% of the total interface area |
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| 700 | 1 | _ | |a Zorn, Reiner |0 P:(DE-Juel1)131067 |b 1 |
| 700 | 1 | _ | |a Jaksch, Sebastian |0 P:(DE-Juel1)157910 |b 2 |u fzj |
| 700 | 1 | _ | |a Frielinghaus, Henrich |0 P:(DE-Juel1)130646 |b 3 |
| 700 | 1 | _ | |a Holderer, Olaf |0 P:(DE-Juel1)130718 |b 4 |
| 773 | _ | _ | |a 10.1063/5.0053446 |g Vol. 155, no. 2, p. 024121 - |0 PERI:(DE-600)1473050-9 |n 2 |p 024121 - |t The journal of chemical physics |v 155 |y 2021 |x 1089-7690 |
| 856 | 4 | _ | |y Restricted |u https://juser.fz-juelich.de/record/894027/files/1063265_1_data_set_17599348_qv3dn5.pdf |
| 856 | 4 | _ | |y Published on 2021-07-13. Available in OpenAccess from 2022-07-13. |u https://juser.fz-juelich.de/record/894027/files/1063265_1_merged_1624345000.pdf |
| 856 | 4 | _ | |y Published on 2021-07-13. Available in OpenAccess from 2022-07-13. |u https://juser.fz-juelich.de/record/894027/files/5.0053446.pdf |
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