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The phenomenon of the polarization suppression of X-ray Umweg multiple waves in Renninger scans of crystals, showing intensity decrease due to properly chosen wavelength and polarization of incident radiation, is observed. With elliptically or linearly polarized synchrotron radiation, partial suppression of the strong Umweg interfered component provides an alternative way of enhancing the visibility of multiple-wave interference in crystals for direct phase determination.
Keywords: Umweg; polarization.
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