Dynamical Theory: a means to explain scattering from periodic structures

Rana Ashkar (Indiana University)

Dynamical Theory calculations developed to explain Spin Echo Resolved Grazing Incidence Scattering (SERGIS) on diffraction gratings have shown to give good account of the obtained data. The theory explained the details of the scattering process and the behavior of the wave function in the vicinity of the grating. It also predicted the possibility of guiding neutrons through the channels of gratings. Comparison of this exact theory to other approximation methods such as Born approximation, Distorted-Wave Born approximation and Phase-Object approximation determines the validity of these approximation methods and the limits of their validity.

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