Dynamical theory calculations of spin-echo resolved grazing-incidence scattering from a diffraction grating
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Neutrons scattered or reflected from a diffraction grating are subject to a periodic potential analogous to the potential experienced by electrons within a crystal. Hence, the wavefunction of the neutrons can be expanded in terms of Bloch waves and a dynamical theory can be applied to interpret the scattering phenomenon. In this paper, a dynamical theory is used to calculate the results of neutron spin-echo resolved grazing-incidence scattering (SERGIS) from a silicon diffraction grating with a rectangular profile. The calculations are compared with SERGIS measurements made on the same grating at two neutron sources: a pulsed source and a continuous wave source. In both cases, the spin-echo polarization, studied as a function of the spin-echo length, peaks at integer multiples of the grating period but there are some differences between the two sets of data. The dynamical theory explains the differences and gives a good account of both sets of results. © 2010, Wiley-Blackwell.
Neutrons, Scattering, Crystals, Atoms, Films, Electrons
Ashkar, R., Stonaha, P., Washington, A. L., Shah, V. R., Fitzsimmons, M. R., Maranville, B., Majkrzak, C. F., Lee, W. T., Schaich, W. L., & Pynn, R. (2010). Dynamical theory calculations of spin-echo resolved grazing-incidence scattering from a diffraction grating. Journal of Applied Crystallography. 43, 455-465. doi:10.1107/s0021889810010642