Publications by authors named "E Kasman"
Rocking curve topography at the Advanced Photon Source's beamline 1-BM measures the x-ray reflection from large (many cm) flat crystals on a sub-mm scale with microradian angular resolution. The (011̄1) reflection at 8 keV is uniform across the crystal and close to theory for three thick quartz wafers well-polished with increasingly finer grit. However, the reflection is non-uniform for some ∼0.
View Article and Find Full Text PDFThe IRIXS Spectrograph represents a new design of an ultra-high-resolution resonant inelastic X-ray scattering (RIXS) spectrometer that operates at the Ru L-edge (2840 eV). First proposed in the field of hard X-rays by Shvyd'ko [(2015), Phys. Rev.
View Article and Find Full Text PDFSmall Bragg-plane slope errors revealed in synthetic diamond crystals.
J Synchrotron Radiat
November 2020
Article Synopsis
- Wavefront-preserving X-ray diamond crystal optics are crucial for X-ray applications, requiring perfectly flat Bragg planes for effective diffraction.
- Research using X-ray rocking curve imaging revealed that the best synthetic diamond crystals have slope errors of about 0.08 µrad mm, which are slightly larger than the 0.05 µrad mm errors found in perfect silicon crystals.
- High-temperature annealing at 1450°C can reduce the slope errors in diamond crystals to levels comparable to those of silicon, with further studies underway to assess their wavefront-preservation capabilities.
The results are reported of an X-ray diffraction study of an Si crystal designed and fabricated for very asymmetric diffraction from the 333 reflection for X-ray energies of 8.100 and 8.200 keV.
View Article and Find Full Text PDFA novel diced spherical quartz analyzer for use in resonant inelastic X-ray scattering (RIXS) is introduced, achieving an unprecedented energy resolution of 10.53 meV at the Ir L absorption edge (11.215 keV).
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