Victor-O. de Haan, J. Plomp, W.G. Bouwman, M. Trinker, M.T. Rekveldt, C.P. Duif, E. Jericha, H. Rauch, A. van Well:

"Phase-object approximation in small-angle neutron scattering experiments on silicon gratings";

Journal of Applied Crystallography,40(2007), S. 151 - 157.

The phase-object approximation for neutron scattering based on a onedimensional

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 of Pendello¨sung

with object size is observed.

Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.