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![[Figure 2]](yn5055fig2mag.jpg)
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Figure 2
Characterizing the incident photon flux from diffraction intensities of single nanoparticles. (a) Single-pulse diffraction pattern measured using a spherical Au nanoparticle of diameter 100 nm. (b) The radial intensity (yellow circles) is fitted to the square of the form factor of an ideal sphere of the same size made of Au (solid line). (c) A histogram of incident flux densities, I0(ri), estimated from 452 single-pulse diffraction patterns is drawn. The black dashed line represents the expected intensity distribution from a 2D Gaussian beam profile with a beam size of 5 µm × 5 µm FWHM. Best fit was obtained using a double-Gaussian beam profile with 2 µm × 2 µm and 6 µm × 6 µm beam sizes in a 4:1 intensity ratio (red dashed line). (d) An intensity histogram from 55 single-pulse diffraction patterns from SACLA is displayed with a single-Gaussian beam profile (dashed line). |
![[Figure 2]](yn5055fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
