Monday, August 1, 2011, 2:30 pm — NSLS-II Seminar Room, Bldg. 817
Coherent diffraction imaging (CDI) technique inverts far-filed diffraction pattern to real-space images using phase retrieval algorithms. Because CDI provides higher radiation dose efficiency compared with lens-based microscope system and has the potential to reach diffraction-limited resolution, it is favorable for image radiation sensitive biological samples. CDI applications on imaging freeze-dried, chemically dried and frozen hydrated yeast cells will be presented. Combined with resonant excitation process, CDI is capable to unravel magnetic domain structures. When operated in Bragg reflection geometry, Bragg CDI recovers real-space images of crystals, with magnitudes represent electron densities and phases represent strain distribution. Presenter will show Bragg CDI studies on silicon-on-insulator and zinc oxide crystals, and discuss the developments on extending Bragg CDI's capability to investigate specimens under extreme conditions, such as heavily strained and in high-pressure environment.
Hosted by: Dr. Yong Chu
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