A method of alignment of a four-circle diffractometer using a small collimator in the centre of the Eulerian cradle

Abstract

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 diffractometer. The method is applicable also with a large initial misalignment of the diffractometer. The results obtained indicate a high reproducibility of the zero-position values, with deviations of the order of the step accuracy of the angle setting.