STRUCTURAL STUDIES OF TETRACHLORIDE LIQUIDS .1. PULSED NEUTRON-SCATTERING BY CARBON TETRACHLORIDE MOLECULAR STRUCTURE

The differential cross-sections for neutron scattering from liquid carbon tetrachloride have been measured with the TSS instrument at the Harwell Electron Linac. Data were taken at seven different scattering angles for a wavelength range of 0-2.3-5 Å. The observed diffraction patterns at high momentum transfer (> 8-30 Å-1) have been analysed in terms of the molecular form factor f1(Q). It was found that the oscillation amplitudes could be satisfactorily described only by introducing an energy-dependent term into the Debye-Waller factors of the form factor. The f1(Q) data were fitted with a four-parameter function for measurements at scattering angles of 150°, 90° and 58°. The carbon-chlorine bond length parameter was accurately defined in all cases and had a mean value of 1.766 ±0.002 Å. The inclusion of an anharmonicity constant in the form factor gave an improved x2-iit to the data with an increased value of 1.770 + 0.002 Å for the bond length. The results are in excellent agreement with other measurements and show the importance of pulsed neutron techniques for molecular structure studies of disordered materials. © 1979 Taylor & Francis Group, LLC.