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Lensless X-ray Imaging of Atomic Surface Structures in the Reflection Geometry using PtychographySpeaker: Dr. Chenhiu Zhu, Materials Science Division, Argonne National Laboratory
401/A5000 @ 11:00 AM
We demonstrate by numerical simulation that atomic structures on single crystal surface can be reconstructed using the ptychography coherent x-ray diffraction imaging in the reflection geometry. Our approach is based on the concept of crystal truncation rod. We can obtain the highest surface sensitivity at anti-Bragg condition, and achieve a phase contrast up to from a single atomic step. Ptychograhy scanning scheme allows us to overcome the stringent requirement for isolated samples in typical CDI experiments. We will show experimental results from real platinum (001) surfaces and their ptychography reconstructions. This technique can be readily applied to buried interfaces under catalytic and electrochemical conditions and to nanoscience applications, such as nanowire with stacking faults.
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402/AUD @ 2:30 PM
402/AUD @ 3:00 PM
ACA 2013APS Conference