Collecting and Processing Neutron Fibre Diffraction Data from a Single-Crystal Diffractometer

The geometries for scanning reciprocal space for a fibre on a neutron single-crystal diffractometer are considered. Geometrical relationships are derived for the particular case of D19 at the Institut Laue-Langevin that can be readily generalized for other instruments and for the same instrument with a different detection system. An optimum data-collection strategy is proposed. Methods for processing neutron fibre data collected using this strategy are described and illustrated by studies on cellulose.