Abstract

The X-ray interbranch resonance concept is extended to crystals with a one-dimensional deformation. The original approach, which proceeds from the Lagrange formalism, is developed. The principle of local `lattice homogeneity' is also incorporated in the resonance concept. It postulates the local translation symmetry by lattice spacings in the vicinity of any point of X-ray trajectories. In this connection, interbranch scattering is considered as the process that violates this principle. The new interbranch effect is predicted for a strongly distorted crystal with thickness of the order of the interbranch extinction length. In this case, the interbranch wavefield oscillations related to the resonance interbranch splitting are suggested for the diffraction profile.