期刊
JOURNAL OF APPLIED CRYSTALLOGRAPHY
卷 45, 期 -, 页码 255-262出版社
WILEY-BLACKWELL
DOI: 10.1107/S0021889812003366
关键词
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资金
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC-02-06CH11357, DEAC-02-98CH10886]
The principles of the virtual source spread (spatial broadening) phenomenon induced by angular dispersion in asymmetric X-ray Bragg reflections are illustrated, from which the virtual source properties are analyzed for typical high-resolution multiple-crystal monochromators, including inline four-bounce dispersive monochromators, back-reflection-dispersion monochromators and nondispersive nested channel-cut monochromators. It is found that dispersive monochromators can produce spread virtual sources of a few millimetres in size, which may prevent efficient microfocusing of the beam as required by inelastic X-ray scattering spectroscopy and other applications. Possible schemes to mitigate this problem are discussed. The analyses may provide important guidelines for designing and optimizing modern high-precision synchrotron X-ray optics and beamline instrumentation for spectroscopy, imaging and nanofocusing applications.
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