Journal of Applied Crystallography

Volume 35, Part 3 (June 2002)

research papers

J. Appl. Cryst. (2002). 35, 314-318 [ doi:10.1107/S0021889802003692 ]

Propagation of X-ray coherence for diffraction of perfect crystals

H. Yamazaki and T. Ishikawa

Abstract: Propagation of X-ray coherence through dynamical diffraction of a perfect crystal is discussed theoretically. A rigorous and general relation between coherence functions before and after diffraction is found by using time-dependent field solutions of Takagi-Taupin equations for a temporally and spatially inhomogeneous incident X-ray pulse. Asymmetry of the diffraction, together with the finite penetration depth, is shown to modify the coherence function in the direction of the diffraction vector.

Keywords: time-dependent Takagi-Taupin equations; perfect crystal diffraction; X-ray coherence; dynamical diffraction.