Extinction effect and Borrmann effect of resonant dynamical scattering in the Bragg case

Abstract

In the Bragg case, X-ray beams suffer from anomalous absorption due to extinction effects without photo-absorption and are localized in the surface when X-ray total reflection occurs around an exact Bragg angle from a perfect crystal. On the other hand, the Borrmann effect due to anomalous transmission occurs in a thin perfect crystal with photo-absorption under a proper condition. There is a clear distinction between the extinction effect and the Borrmann effect. It is found that it is possible to separate the Borrmann effect from the extinction effect when the real part of the atomic scattering factor is zero. The calculated rocking curves agree well with the measured ones around the Ge K-absorption edge of the Ge 844 reflection.