Journal
IUCRJ
Volume 4, Issue -, Pages 741-750Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S2052252517012398
Keywords
orientation determination; structure heterogeneity; single-particle scattering; nanoparticles; core-shell architecture; XFELs
Funding
- National Natural Science Foundation of China [11575021, U1530401, U1430237]
- Human Frontier Science Program [024940]
- National Science Foundation [1120997, 1231306]
- Foundation for the National Institutes of Health [U54GM094625]
- US Department of Energy, Office of Science [DE-AC02-76SF00515]
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [1120997] Funding Source: National Science Foundation
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X-ray free-electron lasers (XFELs) provide new opportunities for structure determination of biomolecules, viruses and nanomaterials. With unprecedented peak brilliance and ultra-short pulse duration, XFELs can tolerate higher X-ray doses by exploiting the femtosecond- scale exposure time, and can thus go beyond the resolution limits achieved with conventional X-ray diffraction imaging techniques. Using XFELs, it is possible to collect scattering information from single particles at high resolution, however particle heterogeneity and unknown orientations complicate data merging in three-dimensional space. Using the Linac Coherent Light Source (LCLS), synthetic inorganic nanocrystals with a core-shell architecture were used as a model system for proof-of-principle coherent diffractive single-particle imaging experiments. To deal with the heterogeneity of the core-shell particles, new computational methods have been developed to extract the particle size and orientation from the scattering data to assist data merging. The size distribution agrees with that obtained by electron microscopy and the merged data support a model with a core-shell architecture.
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