Size-dependent interbranch peculiarities of X-ray extinction in strongly bent crystals.
X-ray diffraction from homogeneously bent crystals is studied within the interbranch resonance concept for large gradient. It is shown that strong deformations lead to an interbranch phase modulation of the transmitted and diffracted waves. It is predicted that prominent extinction effects occur due to the interbranch phase changes. These features are very sensitive to the crystal thickness, so that changes of the order of the interbranch extinction length can affect considerably the rocking-curve structure. Numerical calculations of the diffracted intensity are carried out to illustrate this.
Shevchenko
Michael
M
Institute for Metal Physics, 36 Vernadsky Street, 03142 Kiev, Ukraine. mishevch@yahoo.com