Abstract
Recent developments in the nuclear resonant (M\"ossbauer) scattering of synchrotron radiation (NRSR) allowed one to observe successfully diffusive quasielastically scattered radiation from intermediate nonresonant amorphous targets, e.g., glycerin, in a time domain. Hence, there is a real chance to observe such a radiation scattered coherently at Bragg angles from single crystals containing fast diffusing atoms. Quasielasticity of the latter radiation is solely caused by jumps between various Bravais lattices due to the peculiarity of the Bragg conditions. On the other hand, an energy resolution could be easily increased by two orders of magnitude in comparison with the incoherent quasielastic scattering of the cold neutrons (QNS) at much higher momentum transfer to the crystal than in the case of QNS. The paper is devoted to a discussion of the physics underlying scattering of NRSR beams from fast diffusers in single crystals under Bragg conditions.
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