High-energy coherent diffraction enabled by emulating finer pixels
Scientific Achievement
A sparsity-based numerical approach was developed that recovers intensity patterns suitable for coherent diffraction imaging of nanocrystals from high X-ray energy under-sampled coherent diffractions.
Significance and Impact
This work overcomes a significant challenge in enabling 3D coherent X-ray diffraction imaging at highly penetrating X-ray energies which will be one of the revolutionary capabilities of the Upgraded Advanced Photon Source.
Research Details
- Current coherent diffraction reconstruction algorithms fail when intensity patterns are under-sampled, as occurs at high X-ray energies (> 50 keV) due to reciprocal space scaling.
- The numerical method of emulating finer pixel utilizes multiple measurements of a Bragg peak offset by fractions of a physical pixel size, relieving experimental constraints.
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