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.