Abstract
Adiabatic invariants occurring in the dynamic Laue diffraction of X rays, high-energy electrons, and thermal neutrons are calculated for asymmetric scattering by regularly strained crystals. A criterion for adiabatically smooth variations of strain is found using a generalized pendulum analogy. The conceptual equivalence of the adiabatic and ray modes of Bloch wave propagation in strained crystals is established.
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