Anomalous Transmission of Thermally Scattered X-Rays in Germanium Crystal

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Strong excess lines were observed across the 111 diffuse spots of CuKα and CuKβ radiations in the Bragg arrangement and across the 220 diffuse spot of CuKα radiation in the Laue arrangement on photographs of germanium crystals taken by using unfiltered radiation from copper target operated at accelerating voltage 30 kV.
Crystal orientation dependence of the excess line and intensity variation of the excess line similar to that of thermal diffuse scattering with change in specimen temperature strongly suggest that the excess line is caused by anomalous transmission of the thermally scattered characteristic X-rays in the perfect crystal.