DETERMINATION OF THE STRUCTURE OF FLUID DEUTERIUM CHLORIDE BY NEUTRON-DIFFRACTION AT HIGH-PRESSURE

High-pressure neutron diffraction measurements on liquid and fluid deuterium chloride are reported. Temperature and density were varied over a broad range involving pressures up to nearly 2000 bars. The employed high-pressure equipment and the pressure cell are presented. Data evaluation up to the corrected structure factor is described. Several correction procedures for multiple scattering and self-absorption and for inelastic scattering effects are discussed with regard to their applicability in the present case. The intramolecular structure is determined by fitting to the total differential cross section as well as to the separated intramolecular cross section. A separation of the intra- and the intermolecular contribution is done by means of Fourier transformation. The dependence of the intermolecular radial distribution function on temperature and density is shown.