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Updated: Aug 11, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
Published on: October 11, 2016
Anomalous dispersion behavior of multiple-wave X-ray diffraction at absorption edges: determination of phase change
Y P Stetsko1, G Y Lin, Y S Huang
1Department of Physics, National Tsing Hua University, Hsinchu, Taiwan, Republic of China.
Abstract:
The effects of anomalous dispersion (resonance) on multiple reflection of x rays and their interference in crystals at atomic absorption edges are studied. Intensity ratios of two inversion-symmetry-related multiple diffractions at or near absorption edges exhibit highly phase-sensitive profiles with strong asymmetric characteristics, unlike those far from the edges. A new resonance perturbation Bethe approach is developed to explain this behavior. This leads to direct determination of the phase change for x-ray reflections at resonance.
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