Absolute Intensities of X-Rays Anomalously Diffracted through Nearly Perfect Copper Crystals

Absolute integrated intensities of the x-ray beams "anomalously transmitted" through nearly perfect copper crystals have been measured for the (111) planes for values of $\mu t$ ranging from 10 to 90. Results obtained for both the symmetric and asymmetric Laue geometries are compared with theory. These comparisons yield a value of 0.965±0.003 for the ratio f″(111)/f″(000) and indicate that the crystals investigated have a high degree of perfection. The measurements were made with Mo $K\alpha$ radiation using a double-crystal spectrometer arranged in the parallel condition and with the first crystal diffracting in the Bragg geometry. Measured profiles of the Bragg-Laue double-crystal rocking curves for $\mu t=10\mathrm{} \mathrm{and} 90$ are in semiquantitative agreement with the theory.