A METHOD OF ALIGNMENT OF A 4-CIRCLE DIFFRACTOMETER USING A SMALL COLLIMATOR IN THE CENTER OF THE EULERIAN CRADLE

A procedure is described that uses a small collimator in the center of the Eulerian cradle for the alignment of the incident beam, the zero positions of the circles and the collimators of a four-circle diffract ometer. The method is applicable also with a large initial misalignmen t of the diffractometer. The results obtained indicate a high reproduc ibility of the zero-position values, with deviations of the order of t he step accuracy of the angle setting.