ANALYSIS OF SINGLE-CRYSTAL NEUTRON DIFFUSE-SCATTERING FROM ICE IH

The single-crystal neutron diffuse scattering from ice contains a grea t deal of information, not only on the disorder of the hydrogen atoms but also on the instantaneous atomic positions. It is difficult to ext ract this information, and a series of reverse Monte Carlo (RMC) techn iques have been developed for this purpose, with mixed success. The pr esent paper presents new constrained RMC methods used to try and obtai n more reliable information on the static and thermal disorder in ice. However it has been found that the RMC results depend strongly on the starting configuration, meaning that some of the conclusions of the e arlier paper of Nield and Whitworth (Nield, V. M.; Whitworth, R. W. J. Phys.: Condens. Matter 1995, 7, 8258) are invalid.