Transmission of X-rays through Calcite near the Bragg Angle

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Abstract
Transmitted and diffracted intensities of monochromatic x-ray radiation through single crystals of calcite have been recorded. Wavelengths between 0.631A and 2.29A and crystal thicknesses from 0.1 mm to 3.06 mm were used. A double-crystal spectrometer served as monochromator. Intensities were measured with a Geiger counter. The measurements permit an angular correlation between the transmitted and diffracted curves to within one second of arc. The results show an anomalous absorption near the Bragg angle. Characteristically different results are obtained depending on the crystal thickness and the wavelength. For "thin" crystals the transmitted intensity decreases at the Bragg angle. For "thick" crystals the transmitted intensity increases at the Bragg angle. At each particular wavelength there exists a region of "intermediate" crystal thicknesses for which the transmitted intensity passes through a maximum and minimum as the crystal is rotated through the Bragg angle.

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