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Published online by Cambridge University Press: 06 March 2019
The instrument employs a fully-focussing optical system which allows a wide range of sample-orientations and thus permits determination of the preferred-orientation distribution-function. Hence, measured peak-intensifies can be corrected for non-randomness.
The sample performs a planetary motion around the focus of the primary, monochromatic beam. The angle of incidence can be varied over a wide range of values, including both transmission and reflection. The sample can be rotated in its own plane in a controlled manner. Full illumination is obtained in any position of the sample. The diameter of the Rowland-sphere of the powder-optics remains constant and permits the use of a sphericai sample-layer.