研究目的
To demonstrate the direction-dependent resolution of three-dimensional real-space images obtained from Bragg coherent x-ray diffraction measurements and to propose a metric for determining spatial resolution that accounts for this directional dependence.
研究成果
The study successfully demonstrated the direction-dependent resolution in BCDI measurements, proposing a real-space metric for resolution that accounts for this anisotropy. The resolution varied from 4 nm to 9 nm, with the highest resolution normal to the largest crystal facet. The resolution's dependence on x-ray dose followed a t(cid:5)4 power law, mirroring the scattering intensity's behavior in reciprocal space.
研究不足
The resolution is direction dependent and varies with the sample's morphology and size. The method requires convergence of iterative retrieval algorithms for accurate resolution determination.
1：Experimental Design and Method Selection:
The study employed Bragg coherent x-ray diffraction imaging (BCDI) to measure the 3D structural and strain information of a gold nanocrystal. The methodology included iterative algorithms for phase retrieval and real-space image reconstruction.
2：Sample Selection and Data Sources:
Isolated gold nanocrystals on a silicon substrate were used as samples. The diffraction signal was collected using a Timepix detector.
3：List of Experimental Equipment and Materials:
The experiment utilized a Si (111) monochromator set to
4：0 keV photon energy, a Timepix detector with 512 (cid:
3) 512 pixels, and a sample stage for rocking curve measurements.
5：Experimental Procedures and Operational Workflow:
The detector was placed at the appropriate 2h angle, and the sample stage was rocked through an angle of 2(cid:4) in steps of
6：008(cid:
4) with an exposure time of 2 s per point. The scan was repeated 25 times to correct for instrumentation drift.
7：Data Analysis Methods:
The resolution was calculated using a proposed metric based on the Richardson-Lucy deconvolution algorithm to determine the blurring function that transforms an ideal crystal shape to the actual image.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
