Phase-object approximation in small-angle neutron scattering experiments on silicon gratings
| Autor: | Jeroen Plomp, Helmut Rauch, M. Theo Rekveldt, Ad A. van Well, Martin Trinker, Wim G. Bouwman, E. Jericha, Victor Otto De Haan, C. P. Duif |
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| Rok vydání: | 2007 |
| Předmět: |
Physics
Optics Scattering business.industry Quasielastic neutron scattering Grazing-incidence small-angle scattering Neutron reflectometry Neutron scattering Biological small-angle scattering Born approximation business Small-angle neutron scattering General Biochemistry Genetics and Molecular Biology |
| Zdroj: | Journal of Applied Crystallography. 40:151-157 |
| ISSN: | 0021-8898 |
| DOI: | 10.1107/s0021889806047558 |
| Popis: | The phase-object approximation for neutron scattering based on a one-dimensional dynamic forward scattering theory is discussed and used to calculate the differential cross section of an object. It is shown that this approximation is valid in ultra-small-angle neutron scattering (USANS) and spin-echo small-angle neutron scattering (SESANS) experiments on silicon gratings. In the weak scattering limit, the phase-object approximation reduces to the kinematic or first Born approximation. The spatial coherence function is used to describe instrumental resolution effects. Measurements on three different instruments are in good agreement with calculation results. In the experiment with a time-of-flight SESANS instrument, the effect ofPendellösungwith object size is observed. |
| Databáze: | OpenAIRE |
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